O’Connor, J.
The plaintiff, to whom we have given the pseudonym Jane Doe, appeals from a judgment, after a jury-waived trial, upholding her expulsion from school for at least one year, based on her possession of a lipstick case contain[119]*119ing a one and one-quarter inch blade. We granted her application for direct appellate review.3
In a memorandum of decision, the judge in the Superior Court recited the following facts about which there appears to be no controversy. During the first week of the 1993-1994 school year, in response to the Education Reform Act (Act), St. 1993, c. 71, § 36, the school committee of Worcester (school committee) adopted a “Policy on Possession or Use of Weapons.” That policy provided, in part, that:
“In order to protect the students of the Worcester Public Schools, any student who is found on school premises or at school-sponsored or school-related events, including athletic games, in possession of a dangerous weapon, including, but not limited to, a gun or a knife may be subject to expulsion from the school by the principal regardless of the size of the knife. For purposes of this policy, a dangerous ‘weapon’ includes, but is not limited to, a gun, knife [or other specified items].”
During that week, staff at North High School (North High) distributed copies of the “School Policies, Rules and Services” for North High and “Policies and Programs Handbook in the Worcester Public Schools 1993-1994” (handbooks). Both handbooks contained the “Policy on Possession or Use of Weapons.” Each student at North High received a copy of the handbooks and was required to sign a form acknowledging receipt. In addition to the handbooks, at all relevant times there were signs posted in North High which in[120]*120formed students that possession of a gun or a knife in school may result in expulsion.
The plaintiff moved to Worcester from Tennessee in November, 1992, and entered the ninth grade at North High. She was given a copy of the handbooks and she signed a form acknowledging that she had received them. She saw the posted sighs reminding students of the weapons policy. She understood that a student who brought a knife into school might be expelled.
The plaintiffs parents experienced financial difficulties on their arrival. In the spring of 1993, school officials filed a “51A report” of suspected child abuse when the plaintiffs mother was seen hitting the plaintiff during a softball game. In April, 1993, the plaintiff ran away from home for five days. After moving to Worcester she tried to cut her wrists three times.
The plaintiffs school work was adversely affected by her personal and family problems. Although her grades were good during her first semester at North High, they deteriorated thereafter and she had twenty-three unexcused absences during the 1992-1993 school year. During the first two quarters of tenth grade, her grades were C’s, D’s, and F’s. She was suspended from school several times for leaving school without permission, triggering a false fire alarm, smoking violations, tardiness, and cutting class. -
In October, 1993, the mother of the plaintiffs then boy friend gave her a regular-sized lipstick case which, when twisted open, revealed a pointed, single edge, one and one-quarter inch blade. The blade was sharply pointed but the cutting edge was dull.
On November 4, 1993, the plaintiff tried to cut her left wrist, her third suicide attempt since moving to Worcester. There is no suggestion that she used the lipstick knife to cut her wrist. She bandaged her wrist herself and did not tell her parents. The next morning, she noticed the lipstick knife in her drawer and took it to school to show her friends. During fifth period study hall, she showed the lipstick knife to other students and allowed two other students to hold it.
[121]*121The study hall teacher asked the plaintiff about the bandage on her wrist. She claimed that she had hurt herself falling, but another student told the teacher that the plaintiff had tried to cut herself. Another student interjected that the plaintiff should show the teacher the lipstick knife. She eventually did so, after initially denying that she had it.
The assistant principal at North High, Elizabeth Drake, suspended the plaintiff for five days for having a knife in her possession. Drake also called in the plaintiff’s parents and arranged for them to see a psychiatrist that afternoon. The record contains a letter from the psychiatrist stating that, at that time, the plaintiff was not a threat to herself or to others. Thereafter, the plaintiff saw a social worker several times.
Notice was sent to the plaintiff’s family that there would be a principal’s hearing on November 16, 1993. The notice informed the family that the plaintiff was alleged to have violated the weapons policy and could be expelled. The notice also stated that she had a right to be represented by an attorney and to present evidence and witnesses on her own behalf.
At the hearing, the plaintiff testified that she thought the lipstick knife was a joke. The plaintiff’s social worker testified that the plaintiff needed to be in school and that, in her opinion, the plaintiff had not thought of the lipstick knife as a weapon.
The principal, Robert Boule, decided to expel the plaintiff, effective November 22, 1993, because, in his opinion, she was a threat to the safety of students and staff at the school. His decision was based on several factors, including the fact that the plaintiff had recently attempted suicide on three occasions. He considered the lipstick knife to be a knife. He believed that, although the plaintiff was remorseful, she had knowingly violated the weapons rule.
The plaintiff’s parents were notified by letter that the principal had decided in favor of expulsion and that the plaintiff would be ineligible for readmission until November 22, 1994. They appealed from the principal’s decision, and a second evidentiary hearing was held before the superintendent, Dr. [122]*122James L. Garvey. Superintendent Garvey upheld the expulsion. In making his decision, he considered the lipstick knife itself, the opinion of the plaintiffs social worker that the plaintiff was unstable, the plaintiffs disciplinary record, and her troubled family as factors favoring expulsion.
The city of Worcester does not provide alternative education for students who are expelled for weapons violations unless they are special education students, which the plaintiff was not. The plaintiffs mother, who is a substitute teacher, and a retired school teacher provided some tutoring to the plaintiff during her expulsion, but the family did not make significant efforts to pursue private alternative education options. According to an affidavit of the principal, the plaintiff was readmitted to school in November, 1994, into the tenth grade.
On appeal, the plaintiff argues that, in expelling her, the defendant school officials abused their discretion, acted outside their statutory authority, and violated her fundamental, constitutionally protected interest in a public education. She also argues that, if the court reads G. L. c. 71, § 37H, broadly enough to embrace the lipstick knife as a “dangerous weapon,” then the statute is void for vagueness. The defendants contend that, because the plaintiff has now returned to school, the case is moot.
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O’Connor, J.
The plaintiff, to whom we have given the pseudonym Jane Doe, appeals from a judgment, after a jury-waived trial, upholding her expulsion from school for at least one year, based on her possession of a lipstick case contain[119]*119ing a one and one-quarter inch blade. We granted her application for direct appellate review.3
In a memorandum of decision, the judge in the Superior Court recited the following facts about which there appears to be no controversy. During the first week of the 1993-1994 school year, in response to the Education Reform Act (Act), St. 1993, c. 71, § 36, the school committee of Worcester (school committee) adopted a “Policy on Possession or Use of Weapons.” That policy provided, in part, that:
“In order to protect the students of the Worcester Public Schools, any student who is found on school premises or at school-sponsored or school-related events, including athletic games, in possession of a dangerous weapon, including, but not limited to, a gun or a knife may be subject to expulsion from the school by the principal regardless of the size of the knife. For purposes of this policy, a dangerous ‘weapon’ includes, but is not limited to, a gun, knife [or other specified items].”
During that week, staff at North High School (North High) distributed copies of the “School Policies, Rules and Services” for North High and “Policies and Programs Handbook in the Worcester Public Schools 1993-1994” (handbooks). Both handbooks contained the “Policy on Possession or Use of Weapons.” Each student at North High received a copy of the handbooks and was required to sign a form acknowledging receipt. In addition to the handbooks, at all relevant times there were signs posted in North High which in[120]*120formed students that possession of a gun or a knife in school may result in expulsion.
The plaintiff moved to Worcester from Tennessee in November, 1992, and entered the ninth grade at North High. She was given a copy of the handbooks and she signed a form acknowledging that she had received them. She saw the posted sighs reminding students of the weapons policy. She understood that a student who brought a knife into school might be expelled.
The plaintiffs parents experienced financial difficulties on their arrival. In the spring of 1993, school officials filed a “51A report” of suspected child abuse when the plaintiffs mother was seen hitting the plaintiff during a softball game. In April, 1993, the plaintiff ran away from home for five days. After moving to Worcester she tried to cut her wrists three times.
The plaintiffs school work was adversely affected by her personal and family problems. Although her grades were good during her first semester at North High, they deteriorated thereafter and she had twenty-three unexcused absences during the 1992-1993 school year. During the first two quarters of tenth grade, her grades were C’s, D’s, and F’s. She was suspended from school several times for leaving school without permission, triggering a false fire alarm, smoking violations, tardiness, and cutting class. -
In October, 1993, the mother of the plaintiffs then boy friend gave her a regular-sized lipstick case which, when twisted open, revealed a pointed, single edge, one and one-quarter inch blade. The blade was sharply pointed but the cutting edge was dull.
On November 4, 1993, the plaintiff tried to cut her left wrist, her third suicide attempt since moving to Worcester. There is no suggestion that she used the lipstick knife to cut her wrist. She bandaged her wrist herself and did not tell her parents. The next morning, she noticed the lipstick knife in her drawer and took it to school to show her friends. During fifth period study hall, she showed the lipstick knife to other students and allowed two other students to hold it.
[121]*121The study hall teacher asked the plaintiff about the bandage on her wrist. She claimed that she had hurt herself falling, but another student told the teacher that the plaintiff had tried to cut herself. Another student interjected that the plaintiff should show the teacher the lipstick knife. She eventually did so, after initially denying that she had it.
The assistant principal at North High, Elizabeth Drake, suspended the plaintiff for five days for having a knife in her possession. Drake also called in the plaintiff’s parents and arranged for them to see a psychiatrist that afternoon. The record contains a letter from the psychiatrist stating that, at that time, the plaintiff was not a threat to herself or to others. Thereafter, the plaintiff saw a social worker several times.
Notice was sent to the plaintiff’s family that there would be a principal’s hearing on November 16, 1993. The notice informed the family that the plaintiff was alleged to have violated the weapons policy and could be expelled. The notice also stated that she had a right to be represented by an attorney and to present evidence and witnesses on her own behalf.
At the hearing, the plaintiff testified that she thought the lipstick knife was a joke. The plaintiff’s social worker testified that the plaintiff needed to be in school and that, in her opinion, the plaintiff had not thought of the lipstick knife as a weapon.
The principal, Robert Boule, decided to expel the plaintiff, effective November 22, 1993, because, in his opinion, she was a threat to the safety of students and staff at the school. His decision was based on several factors, including the fact that the plaintiff had recently attempted suicide on three occasions. He considered the lipstick knife to be a knife. He believed that, although the plaintiff was remorseful, she had knowingly violated the weapons rule.
The plaintiff’s parents were notified by letter that the principal had decided in favor of expulsion and that the plaintiff would be ineligible for readmission until November 22, 1994. They appealed from the principal’s decision, and a second evidentiary hearing was held before the superintendent, Dr. [122]*122James L. Garvey. Superintendent Garvey upheld the expulsion. In making his decision, he considered the lipstick knife itself, the opinion of the plaintiffs social worker that the plaintiff was unstable, the plaintiffs disciplinary record, and her troubled family as factors favoring expulsion.
The city of Worcester does not provide alternative education for students who are expelled for weapons violations unless they are special education students, which the plaintiff was not. The plaintiffs mother, who is a substitute teacher, and a retired school teacher provided some tutoring to the plaintiff during her expulsion, but the family did not make significant efforts to pursue private alternative education options. According to an affidavit of the principal, the plaintiff was readmitted to school in November, 1994, into the tenth grade.
On appeal, the plaintiff argues that, in expelling her, the defendant school officials abused their discretion, acted outside their statutory authority, and violated her fundamental, constitutionally protected interest in a public education. She also argues that, if the court reads G. L. c. 71, § 37H, broadly enough to embrace the lipstick knife as a “dangerous weapon,” then the statute is void for vagueness. The defendants contend that, because the plaintiff has now returned to school, the case is moot.
At the outset, we address the defendants’ claim that this appeal should be dismissed because the issues involved are moot. The defendants argue that, because the plaintiff has been readmitted to school and is doing well, has been offered tutoring and counselling services by Worcester, and because her disciplinary record is required by law to be kept confidential, the remedies sought by the plaintiff in her complaint have been provided to her, and she no longer has any personal stake in the outcome of this case.
The plaintiff argues that the defendants’ offer of tutoring and sessions with the school counsellor does not moot her claims. In addition, on February 13, 1995, the plaintiff filed a motion to strike from the record on appeal the contents of the addendum to the defendant’s brief other than that part of [123]*123the affidavit of Principal Boule documenting the readmission of the plaintiff to the Worcester public schools. The defendants seek to establish by this addendum that the plaintiff has returned to school, is doing well, and has been offered tutoring and counselling services by Worcester. The plaintiff argues that because the information in the addendum concerns events which happened since the judge rendered her decision and thus could not be part of the record, those materials are not properly before this court on review. We deny the motion. Affidavits are the proper way to raise a question of mootness. Hubrite Informal Frocks, Inc. v. Kramer, 297 Mass. 530, 532-533 (1937), and cases cited. We do not agree with the plaintiff’s argument that, because the judge did not consider evidence which was not in existence until six months after the trial ended, we should not consider that evidence even as to the issue whether this appeal is moot. Her argument would, in effect, preclude the raising of any claim of mootness at the appellate level.
We agree with the plaintiff’s argument, however, that her claims are not moot. As the trial judge found, the plaintiff will need compensatory education to remedy her year out of school. No showing has been made that the services offered by the defendants will appropriately compensate her for the year she missed. In addition, although the defendants say that they will keep the plaintiff’s school records confidential, she is subject to release of educational records, including disciplinary records, without her consent in certain circumstances. See 603 Code Mass. Regs. § 23.07(3) (1994); 20 U.S.C. § 1232g (b) (1) (1994); 34 C.F.R. § 99.31 (1993). The plaintiff, therefore, has a real and substantial stake in the outcome of her case. Moreover, the conduct complained of is “capable of repetition, yet evading review.” This is because a student is usually readmitted to school following the enforcement of disciplinary rules before his or her case can be heard on appeal. See, e.g., Honig v. Doe, 484 U.S. 305, 317-323 (1988) (because an aggrieved student will often be finished with school or otherwise ineligible for protections under Federal law by the time review can be had in court, [124]*124the conduct complained of is “capable of repetition, yet evading review”). In light of the foregoing, we conclude that a decision on the merits will best serve the public interest.
We now turn to the plaintiff’s arguments that, in expelling her, the defendants abused their discretion, acted ultra vires, and violated her fundamental right to a public education.
1. Abuse of discretion. The plaintiff contends that the defendant principal and the defendant superintendent abused their discretion in expelling her. We do not agree. The Education Reform Act, St. 1993, c. 71, § 36, rewrote G. L. c. 71, § 37H, to make it easier for school officials to expel students who possessed a weapon at school or school-related functions. Section 37H, as amended, provides in pertinent part:
“The superintendent of every school district shall publish the district’s policies pertaining to the conduct of teachers and students. . . .
“Each school district’s policies pertaining to the conduct of students shall include the following: disciplinary proceedings, including procedures for due process; standards and procedures for suspension and expulsion of students;. . . standards and procedures to assure school building security and safety of students and school personnel; and the disciplinary measures to be taken in cases involving the possession or use of illegal substances or weapons ....
“In each school building containing the grades nine to twelve, inclusive, the principal, in consultation with the school council, shall prepare and distribute to each student a student handbook setting forth the rules pertaining to the conduct of students. . . .
“Notwithstanding any general or special law to the contrary, all student handbooks shall contain the following provisions:
[125]*125“(a) Any student who is found on school premises or at school-sponsored or school-related events, including athletic games, in possession of a dangerous weapon, including, but not limited to, a gun or a knife; or a controlled substance as defined in chapter ninety-four C, including, but not limited to, marijuana, cocaine, and heroin, may be subject to expulsion from the school or school district by the principal. . . .
“(c) Any student who is charged with violation of . . . paragraph (a) . . . shall be notified in writing of an opportunity for a hearing; provided, however, that the student may have representation, along with the opportunity to present evidence and witnesses at said hearing before the principal.
“After said hearing, a principal may, in his discretion, decide to suspend rather than expel a student who has been determined by the principal to have violated . . . paragraph (a) . . . provided, however, that any principal who decides that said student should be suspended shall state in writing to the school committee his reasons for choosing the suspension instead of the expulsion as the most appropriate remedy. In this statement, the principal shall represent that, in his opinion, the continued presence of this student in the school will not pose a threat to the safety, security and welfare of the other students and staff in the school.
“(d) Any student who has been expelled from a school district pursuant to these provisions shall have the right to appeal to the superintendent. The expelled student shall have ten days from the date of the expulsion in which to notify the superintendent of his appeal. The student has the right to counsel at a hearing before the superintendent. The subject matter of the appeal shall not be limited solely to a factual determination of whether the student has violated any provisions of this section.” (Emphasis added).
[126]*126Section 37H, therefore, permits a principal, in his discretion, to suspend rather than expel a student who is found to have violated the weapons policy. However, a principal is not permitted to exercise his discretion and decide on suspension rather than expulsion unless he or she is of the opinion that the student “will not pose a threat to the safety, security and welfare of the other students and staff in the school.” In the instant case, based on the evidence presented at the principal’s hearing, Principal Boule was not of the opinion that the plaintiff would not pose a threat to the safety of the other students and staff at the school. Under the statute, then, he was required to expel the plaintiff. He could not exercise his discretion and do otherwise. Accordingly, we conclude that Principal Boule did not exercise discretion. It follows that he did not abuse his discretion.
The plaintiff’s argument that Superintendent Garvey abused his discretion also lacks merit. Section 37H grants broad discretionary authority to the principal, not to the superintendent. The superintendent is responsible for reviewing the principal’s decision to determine whether the principal abused his discretion or was arbitrary or capricious. See, e.g., Mayor of Revere v. Civil Serv. Comm’n, 31 Mass. App. Ct. 315, 322 (1991). In the present case, the condition for Principal Boule’s exercise of discretion was never met. Moreover, there was more than adequate evidence before Principal Boule to support his unwillingness to opine that the plaintiff was not a threat to others. Therefore, Superintendent Garvey properly upheld the principal’s decision in this case.
2. Ultra vires. General Laws c. 71, § 37H, requires high school principals to prepare and distribute to each student a handbook containing a provision that a student who is found on school premises “in possession of a dangerous weapon, including, but not limited to ... a knife . . . may be subject to expulsion ... by the principal.” The term “dangerous weapon” is not defined in § 37H. The plaintiff argues that the term should be construed in accordance with existing statutory and common law in order to promote uniformity in the implementation of § 37H throughout the schools of the [127]*127Commonwealth. In particular, the plaintiff urges this court to interpret the term “dangerous weapon” to include only those items listed in G. L. c. 269, § 10 (6) (1992 ed.). That statute makes it a crime to carry on one’s person or under one’s control in a motor vehicle any one of a number of items, including,
“any stiletto, dagger, or a device or case which enables a knife with a locking blade to be drawn at a locked position, any ballistic knife, or any knife with a detachable blade capable of being propelled by any mechanism, dirk knife, any knife having a double-edged blade, or a switch knife, or any knife having an automatic spring release device by which the blade is released from the handle, having a blade of over one and one-half inches.”
The judge rejected the interpretation of § 37H which the plaintiff urges, stating as follows:
“There is no sound basis, absent a specific legislative mandate, to import into a school setting a standard required by the criminal law. . . . Schools are charged with the daunting task of educating children from diverse backgrounds, with diverse abilities, needs and problems. ... If effective education is to be possible, school authorities must provide and maintain a safe learning environment. Educators of necessity have broad authority to maintain order, discipline and safety; the exercise of such authority must be left to their sound discretion since so many variables are inherently involved. . . . There is no reason to believe that the Legislature wished to limit the types of knives which a student was forbidden to bring to school. Indeed, there is no reason to believe that the Legislature wanted school authorities to forbear with respect to those knives not included within the criminal statute until such time as those knives are actually used by students and increase the risk to others in the school community. . . .”
[128]*128We agree with the judge that, in light of the broad disciplinary authority historically conferred on school officials, it appears that the Legislature intended to leave the determination whether a particular object is a dangerous weapon to the sound judgment of the principal. Section 37H does not explicitly limit the types of knives which could be considered dangerous weapons. Instead, the Legislature used an all inclusive phrase, “including but not limited to a gun or a knife.” If the Legislature had intended the term “dangerous weapon” to include only those items set forth in G. L. c. 269, § 10 (6), it could easily have done so expressly, which it did not. As the judge pointed out, “[tjhis omission can only be viewed as intentional since, in the very same sentence [of § 37H], the Legislature specifically defined prohibited illegal substances as ‘controlled substance [s] as defined in chapter ninety-four C.’ G. L. c. 71, § 37H.” If the Legislature intentionally omits language from a statute, no court can supply it. Boylston Water Dist. v. Tahanto Regional Sch. Dist., 353 Mass. 81, 84 (1967), quoting Mitchell v. Mitchell, 312 Mass. 154, 161 (1942).
In the present case, the item in question, a lipstick case which, when opened, revealed a one and one-quarter inch blade, had no apparent purpose except to inflict harm. The plaintiff does not suggest otherwise. We conclude, as did the trial judge, that Principal Boule was justified in determining that the lipstick knife was a dangerous weapon under the school weapons policy. Accordingly, the plaintiff’s expulsion was authorized by § 37H.
3. Constitutional right to an education under the State Constitution. Part II, c. 5, § 2, of the Massachusetts Constitution provides that “it shall be the duty of legislatures and magistrates, in all future periods of this Commonwealth, to cherish . . . public schools and grammar schools in the towns.” In McDuffy v. Secretary of the Executive Office of Educ., 415 Mass. 545, 621 (1993), the court interpreted this clause to “impose an enforceable duty on the magistrates and Legislatures of this Commonwealth to provide education in the public schools for the children there enrolled, whether [129]*129they be rich or poor and without regard to the fiscal capacity of the community or district in which such children live.” The question before the court in McDuffy, supra, was whether the Massachusetts school-financing system was constitutional, and the court held that it was not.
The plaintiff asserts that McDuffy should be construed as holding that she, as an individual, has a “fundamental right” to a public education under Part II, c. 5, § 2. From this assertion, she argues that her expulsion violated her right to substantive due process under the Massachusetts Constitution because expulsion was not the appropriate discipline. It was, she claims, not the least restrictive alternative since either suspension or the provision of alternate education was feasible. The judge refused to read McDuffy in the manner advocated by the plaintiff, stating:
“[The plaintiff] does not have a fundamental right to an education in the sense asserted. The right which [she] does have is that of an equal opportunity to an adequate education, a right which she may lose by conduct seen to be detrimental to the community as a whole. The Legislature has made plain that school officials may exclude students such as [the plaintiff] who violate school rules which proscribe weapons possession in school. It is not difficult to see how such rules further the welfare of the school community.”
We agree that McDuffy should not be construed as holding that the Massachusetts Constitution guarantees each individual student the fundamental right to an education. While the court acknowledged in McDuffy the importance of education and decided that the Commonwealth generally has an obligation to educate its children, the court did not hold, and we decline to hold today, that a student’s right to an education is a “fundamental right” which would trigger strict scrutiny analysis whenever school officials determine, in the interest of [130]*130safety, that a student’s misconduct warrants expulsion.4 In fact, the court implicitly recognized in McDuffy that educational opportunities can be lost by students as a result of [131]*131their actions. There, the court quoted portions of earlier decisions which affirmed the authority of the Legislature and school officials to exclude students who misbehave:
“In a series of cases, this court has held that various actions of the Legislature accorded with the ‘duty’ imposed on it by Part II, c. 5, § 2, and has characterized the duty as the ‘public obligation to provide for general education.’ Nicholls v. Mayor & School Comm. of Lynn, 297 Mass. 65, 68 (1937). There we stated: ‘In the performance of the obligation thus imposed on the Commonwealth’ by Part II, c. 5, § 2, it was ‘within the competency of the General Court’ to enact a statute ‘requiring the flag salute and the pledge of allegiance’ in the public schools. ... In Antell v. Stokes, 287 Mass. 103, 105-06 (1934), we declared: ‘Education of youth was provided at public expense and with anxious solicitude through the colonial and provincial periods of our history. The duty to maintain and cherish public schools was declared in the Constitution, c. 5, § 2.’ Further, we noted that the General Court had taken ‘jealous care’ to clothe ‘municipal officers with adequate authority to encourage the highest practicable efficiency of the system of public education . . . and, that, therefore, the Haverhill school committee was fully empowered to issue and enforce a rule forbidding public high school students from participating in secret societies.” McDuffy, supra at 602.
McDuffy, therefore, suggests that the Legislature’s and school officials’ duty to provide children an adequate public education includes the duty to provide a safe and secure environment in which all children can learn. Our prior decisions support the view that a student’s interest in a public education can be forfeited by violating school rules. See Nicholas B. v. School Comm. of Worcester, 412 Mass. 20, 21-23 (1992) (school committee did not exceed disciplinary authority by expelling student who assaulted a fellow student off [132]*132school grounds and there was no requirement of showing compelling interest); Leonard v. School Comm. of Attleboro, 349 Mass. 704, 708-709 (1965) (school has right to expel student provided school committee’s actions supported by rational basis); Sherman v. Charlestown, 8 Cush. 160, 163-164 (1851) (enjoyment of benefit of education is common right and not an exclusive personal one; therefore, school committee has power, in order to maintain discipline, to exclude from school pupil for good and sufficient cause).
In light of our conclusion that the plaintiff does not have a fundamental right to an education under Part II, c. 5, § 2, we apply the lowest level of scrutiny, the rational basis test, to her claim that the defendants’ actions pursuant to § 37H violated her right to substantive due process under the State Constitution. See, e.g., Marshfield Family Skateland, Inc. v. Marshfield, 389 Mass. 436, 445-446, appeal dismissed, 464 U.S. 987 (1983) (governmental action which intrudes on interests deemed nonfundamental by court must simply be rationally related to a legitimate State objective to pass constitutional muster).
The plaintiff first contends that, on the facts of her case, suspension rather than expulsion was the appropriate penalty. Applying the rational basis test, we conclude, as did the trial judge, that her expulsion did not violate her right to substantive due process under the State Constitution, since “[i]t [was] reasonable and rational for school officials to determine that [the plaintiff] should be expelled as a means of insuring school safety.”
The plaintiff’s next argument is that, even assuming that expulsion had been warranted by the facts, the defendant school officials’ choice to expel her without providing her an alternate educational program violated her substantive due process rights under the Massachusetts Constitution. We do not agree. Under the minimal scrutiny of the rational basis test, the fact that a less onerous alternative exists is irrelevant. Thus, since her expulsion was rationally related to the maintenance of order in the school, the defendants’ decision [133]*133not to provide the plaintiff with an alternate education does not render her expulsion unconstitutional.
This is consistent with our holding in Board of Educ. v. School Comm. of Quincy, 415 Mass. 240, 244-246 (1993), that there is no requirement under Massachusetts law that a school system provide an educational alternative to a student who properly has been expelled for disciplinary reasons. It reasonably may be argued that a requirement that a student who is expelled for misconduct, no matter how egregious, be provided with alternate education by a public school system, would be likely to have a serious detrimental effect on the ability of school officials to deter dangerous behavior within a school by imposing expulsion as a sanction. In any event, we think that it is for the Legislature, not the courts, to decide when, if ever, alternative education must be provided to students expelled for disciplinary reasons, and the form such education must take.
4. Substantive due process under the United States Constitution. The plaintiff argues that her expulsion violated her substantive due process rights under the Fourteenth Amendment to the United States Constitution. We do not agree. A person does not have a fundamental right to an education under the Federal Constitution. Thus, the appropriate level of scrutiny is the rational basis test. San Antonio Indep. Sch. Dist. v. Rodriguez, 411 U.S. 1, 38-40 (1973) (rational basis test to be applied to State action which infringes on person’s right to obtain education). So long as the official action is directed to a legitimate or substantial purpose and is rationally related to achieving that purpose, it is not unconstitutional. Plyler v. Doe, 457 U.S. 202, 224 (1982), Williamson v. Lee Optical of Okla., Inc., 348 U.S. 483, 491 (1955). Applying the rational basis test to the facts of this case, we conclude that the plaintiff’s expulsion was rationally related to the school officials’ interest in protecting other students and staff from potential violence. Accordingly, her expulsion did not violate her substantive due process rights under the United States Constitution.
[134]*1345. Void for vagueness. Finally, the plaintiff argues that if the lipstick knife which she possessed is a dangerous weapon under G. L. c. 71, § 37H, the statute is void for vagueness and its application to her violates her due process rights as guaranteed by art. 10 of the Massachusetts Declaration of Rights and the Fourteenth Amendment. We disagree.
A law is void for vagueness if persons “of common intelligence must necessarily guess at its meaning and differ as to its application.” Caswell v. Licensing Comm’n for Brockton, 387 Mass. 864, 873 (1983), quoting Smith v. Goguen, 411 U.S. 566, 572 n.8 (1974). A statute must define an offense only with sufficient definiteness so that ordinary people can understand what conduct is prohibited and so that it does not encourage arbitrary and discriminatory enforcement. Commonwealth v. Taylor, 413 Mass. 243, 248 (1992). General Laws c. 71, § 37H, states that “[a]ny student who is found on school premises ... in possession of a dangerous weapon, including, but not limited to, a gun or a knife . . . may be subject to expulsion . . . .” The statute clearly prohibits the bringing of knives onto school grounds. The type of knives included as dangerous weapons in § 37H is all inclusive. As the trial court noted, “The term ‘knife’ is generic and commonly used and understood.”
In the instant case, the plaintiff brought a knife to school, an act which was clearly prohibited. When the plaintiff told the study hall teacher that she did not have the knife, her fellow classmates explained to the teacher that the knife was inside the lipstick case. The language of § 37H was definite enough to alert all the other students as to which conduct was forbidden. We conclude that § 37H is not unconstitutionally vague. See Wood v. Strickland, 420 U.S. 308, 324-325 (1975), overruled on other grounds, Harlow v. Fitzgerald, 457 U.S. 800 (1982) (school officials need not use statutory definition of intoxicating liquor in interpreting school rule prohibiting possession of intoxicating beverages).
6. Conclusion. In summary, we conclude that this case is not moot because the plaintiff has a substantial stake in the outcome, and because the conduct complained of is “capable [135]*135of repetition, yet evading review.” We reject the plaintiffs arguments that the defendants abused their discretion, acted outside their statutory authority, and violated the plaintiffs State and Federal constitutional rights to an education. Finally, we conclude that G. L. c. 71, § 37H, is not unconstitutionally vague.
Judgment affirmed.