The opinion of the Court was delivered by
STEIN, J.
In this case, as in State v. Brana, 127 N.J. 64, 601 A.2d 1160 (1992), also decided today, we consider the validity of the anti-merger provision of N.J.S.A. 2C:35-7, which prohibits distribution of controlled dangerous substances within a school zone, as applied to a defendant who committed first- and second-degree violations of N.J.S.A. 2C:35-5, the provision of New Jersey’s Controlled Dangerous Substances Act (the Act) that generally prohibits the manufacturing, distribution, or dispensing of controlled dangerous substances.
Violations of N.J.S.A. 2C:35-5 (Section 5 of the Act) range from first-to fourth-degree crimes; only first-degree violations carry a period of parole ineligibility. N.J.S.A. 2C:35-5(b)(1); 2C:35-5(b)(6). N.J.S.A. 2C:35-7 (Section 7 of the Act) provides that any violation of Section 5 committed within 1,000 feet of a school zone constitutes a separate third-degree offense requiring imposition of a term of parole ineligibility. In addition, Section 7 bars merger of school-zone convictions with convictions under Section 5.
In State v. Gonzalez, 123 N.J. 462, 588 A.2d 816 (1991), we held that principles of statutory construction require third- and fourth-degree Section 5 offenses to merge into Section 7 (school-zone offenses), but explicitly reserved decision regarding whether first- or second-degree Section 5 convictions merge with school-zone offenses. Id. at 464, 588 A.2d 816. [45]*45Here, we decide the constitutional issues not reached in Gonzalez, and conclude that subjecting a defendant to punishment for both first- or second-degree Section 5 offenses and a related school-zone offense would violate federal double-jeopardy principles. We therefore construe the statute in order both to preserve its constitutionality and to fulfill the apparent intent of the Legislature. State v. LeFurge, 101 N.J. 404, 423, 502 A.2d 35 (1986); State v. Profaci, 56 N.J. 346, 350, 266 A.2d 579 (1970). We hold that convictions for school-zone offenses must merge into convictions for related first- or second-degree Section 5 offenses, but that in such cases a mandatory minimum sentence no less severe than that required by the school-zone statute should nevertheless be imposed on defendants convicted of a Section 5 offense.
I
The parties do not contest the relevant facts. David Dillihay was arrested by undercover detectives investigating possible narcotics activity at an Atlantic City bar located within 1,000 feet of a school zone. The detectives observed Dillihay drop a film container as one of the detectives approached him. The five tin foil packets that were in the container held phencyclidine-coated marijuana. Dillihay was charged with and convicted of the following offenses:
1. possession of less than one ounce of marijuana with intent to distribute (N.J.S.A. 2C:35-5a(1) and -5b(12)) (fourth degree);
2. possession of marijuana with intent to distribute within a school zone (N.J.S.A. 2C:35-7) (third degree);
3. possession of phencyclidine (N.J.S.A. 2C:35-10a(l)) (third degree);
4. possession of phencyclidine with intent to distribute (N.J.S.A. 2C:35-5a(1) and -5b(7)) (second degree);
5. possession of phencyclidine with intent to distribute within a school zone (N.J.S.A. 2C:35-7) (third degree).
Observing that Dillihay’s Section 5 and Section 7 offenses constituted only a single criminal transaction, the Law Division merged the school-zone convictions with the Section 5 convictions. The court determined that to uphold both convictions [46]*46would violate fundamental principles of due process, if not federal or state guarantees against double jeopardy, but observed that the Legislature intended that defendants convicted of a school-zone offense be required to serve sentences with a period of parole ineligibility. In accordance with Section 5, the trial court sentenced Dillihay to concurrent terms of seven years and fifteen months for his convictions arising from possession of phencyclidine and marijuana, and also imposed the mandatory minimum term required by Section 7. Dillihay’s aggregate sentence was seven years, with two years of parole ineligibility.
The Appellate Division affirmed, 241 N.J.Super. 553, 556, 575 A.2d 876 (1990), relying in part on Judge Skillman’s dissent in State v. Gonzalez, 241 N.J.Super. 92, 99, 574 A.2d 487 (App. Div.1990). The majority of the Dillihay panel concluded that the Section 5 and Section 7 offenses must merge, but that the mandatory minimum sentence required by Section 7 should be imposed. 241 N.J.Super. at 556, 575 A.2d 876. The dissenting member was of the view that the Legislature had intended to create two separate crimes that would not merge. Ibid. The State appeals as of right to this Court.
II
In addressing questions of merger, we have recognized that merger is rooted in the established principle that “ ‘an accused [who] has committed only one offense * * * cannot be punished as if for two.’ ” State v. Cole, 120 N.J. 321, 325-26, 576 A.2d 864 (1990) (citing State v. Miller, 108 N.J. 112, 116, 527 A.2d 1362 (1987); State v. Davis, 68 N.J. 69, 342 A.2d 841 (1975)). We have acknowledged that the question whether to merge convictions implicates a defendant’s substantive constitutional rights, although we have not specified whether those rights are rooted in principles of double jeopardy, due process, or some other legal tenet. Cole, supra, 120 N.J. at 327, 576 A.2d 864; State v. Truglia, 97 N.J. 513, 522, 480 A.2d 912 [47]*47(1984); State v. Best, 70 N.J. 56, 61, 356 A.2d 385 (1976); State v. Davis, supra, 68 N.J. at 77, 342 A.2d 841 (1975). We have eschewed a mechanical approach to merger issues in favor of the flexible approach advocated in State v. Davis, id. at 81, 342 A.2d 841, in which a court considering whether to merge convictions should focus on the elements of the crime, the Legislature’s intent in enacting the statutes, and the specific facts of each case. Cole, supra, 120 N.J. at 327, 576 A.2d 864. Nonetheless, multiple convictions for related offenses cannot stand in contravention of constitutional principles. Therefore, we examine defendant’s claim that to allow separate convictions under both Section 5 and the school-zone statute would violate double-jeopardy principles.
We have consistently interpreted New Jersey’s constitutional double-jeopardy protection, N.J. Constitution, article I, paragraph 11, as co-extensive with the guarantee of the federal constitution. U.S. Const. amend. V; State v. Churchdale Leasing, 115 N.J. 83, 107-08, 557 A.2d 277 (1989); State v. DeLuca, 108 N.J. 98, 102, 527 A.2d 1355 (1987); State v. Soto, 241 N.J.Super. 476, 479, 575 A.2d 501 (App.Div.1990). We have not determined, nor need we do so here, whether or to what extent New Jersey’s constitutional guarantee affords greater protection than does the federal constitution. Churchdale Leasing, supra, 115 N.J. at 108, 557 A.2d 277. To evaluate whether to convict a defendant for violating both Section 5 and the school-zone statute by the same conduct is permissible, we first examine the federal law of double jeopardy.
Federal double-jeopardy principles require a two-step analysis to determine whether multiple punishment violates double jeopardy. Missouri v. Hunter, 459 U.S. 359, 368-69, 103 S.Ct. 673, 679, 74 L.Ed.2d 535, 543-44 (1983); Albernaz v. United States, 450 U.S. 333, 344, 101 S.Ct. 1137, 1145, 67 L.Ed.2d 275, 285 (1981); Blockburger v. United States, 284 U.S. 299, 304, 52 S.Ct. 180, 182, 76 L.Ed. 306, 309 (1932). The first step requires the court to consider whether the legislature [48]*48intended to impose multiple punishments. Albernaz, supra, 450 U.S. at 344, 101 S.Ct. at 1145, 67 L.Ed.2d at 285. The federal double-jeopardy guarantee “serves principally as a restraint on courts and prosecutors.” Brown v. Ohio, 432 U.S. 161, 165, 97 S.Ct. 2221, 2225, 53 L.Ed.2d 187, 193 (1977). Therefore, “[w]here * * * a legislature specifically authorizes cumulative punishment under two statutes, * * * a court’s task of statutory construction is at an end * * * and the trial court or jury may impose cumulative punishment.” Missouri v. Hunter, supra, 459 U.S. at 368-69, 103 S.Ct. at 679, 74 L.Ed.2d at 544.
If, however, the legislative intent to allow multiple punishment is not clear, the Court must then apply the test articulated in Blockburger, supra, 284 U.S. at 304, 52 S.Ct. at 182, 76 L.Ed. at 309, to determine whether the defendant is unconstitutionally faced with multiple punishment for the “same” offense. In the absence of legislative intent to authorize cumulative punishment, to punish a defendant twice for the same offense is unconstitutional. Missouri v. Hunter, supra, 459 U.S. at 366, 103 S.Ct. at 678, 74 L.Ed.2d at 542 (citing Whalen v. United States, 445 U.S. 684, 691, 100 S.Ct. 1432, 1437, 63 L.Ed.2d 715, 723 (1980)). Under Blockburger, two offenses are the same unless “each [offense] requires proof of an additional fact which the other does not.” 284 U.S. at 304, 52 S.Ct. at 182, 76 L.Ed. at 309.
In New Jersey, we have applied the analysis set forth in Missouri v. Hunter and Blockburger v. United States to cases involving double-jeopardy questions. See Churchdale Leasing, supra, 115 N.J. at 103-07, 557 A.2d 277; State v. DeLuca, 108 N.J. 98, 527 A.2d 1355 (1987); State v. Dively, 92 N.J. 573, 578-83, 458 A.2d 502 (1983). To determine whether the non-merger provision of the school-zone statute violates double jeopardy, we first inquire whether the Legislature clearly intended to permit multiple punishment for violations of both Section 5 and the school-zone statute.
[49]*49The language of the school-zone statute that controls merger states that
[notwithstanding the provisions of N.J.S. 2C:l-8 or any other provisions of law, a conviction arising under this section shall not merge with a conviction for a violation of * * * N.J.S. 20:35-5 * * * or N.J.S. 20:35-6. [N.J.S.A. 20:35-7 (emphasis added).]
On its face, that provision prohibits merger of a school-zone conviction with any other violation of Section 5. Nevertheless, whether the statutory language contemplates multiple punishments for convictions under both Section 5 and Section 7, or whether it serves only to prohibit merger for sentencing purposes in order that the mandatory minimum sentence authorized in Section 7 be preserved is unclear.
Had the Legislature intended multiple punishment, it could have explicitly authorized consecutive sentencing for related Section 5 and Section 7 offenses. However, Section 7’s non-merger provision neither mandates nor refers to consecutive sentencing, leaving to the discretion of the sentencing court whether to impose single or multiple punishment for convictions of related Section 5 and Section 7 offenses. In such cases courts typically have imposed concurrent rather than consecutive sentences. See State v. Graham, 245 N.J.Super. 257, 259, 584 A.2d 878 (App.Div.1991); State v. Gonzalez, supra, 241 N.J.Super. at 95, 574 A.2d 487; State v. Anaya, 238 N.J.Super. 31, 33, 568 A.2d 1208 (App.Div.1990); State v. Blow, 237 N.J.Super. 184, 186, 567 A.2d 253 (App.Div.1989). But see State v. Soto, 241 N.J.Super. 476, 477, 575 A.2d 501 (App.Div. 1990) (imposing consecutive sentencing). The normative choice of concurrent rather than consecutive sentences suggests that related violations of Section 5 and Section 7 do not ordinarily justify consecutive sentences, see State v. Yarbough, 100 N.J. 627, 643-44, 498 A.2d 1239 (1985), and that the Legislature has not expressed a clear preference for consecutive sentences.
In determining whether the language of Section 7 clearly authorizes multiple punishment for violations of Section 5 within a school zone, we also note that the reported cases are [50]*50divided in their interpretation of the non-merger clause. Although some Appellate Division panels interpreted the provision to prohibit merger completely, see Graham, supra, 245 N.J.Super. at 261-62, 584 A.2d 878; Gonzalez, supra, 241 N.J.Super. at 97, 574 A.2d 487; Anaya, supra, 238 N.J.Super. at 39, 568 A.2d 1208; Blow, supra, 237 N.J.Super. at 191, 567 A.2d 253, others have concluded that merger is permissible under certain circumstances despite the statutory language. See Dillihay, supra, 241 N.J.Super. at 556, 575 A.2d 876; Soto, supra, 241 N.J.Super. at 478, 575 A.2d 501. Our recent decision in Gonzalez, supra, 123 N.J. 462, 588 A.2d 816, also reflects the view that the Legislature did not clearly intend to bar merger of related Section 5 and Section 7 convictions. There we held that third- and fourth-degree Section 5 convictions may merge into convictions under Section 7. Id. at 464, 588 A.2d 816. This divergence of judicial views concerning the non-merger provision suggests that the legislative intent, whatever it may have been, was not expressed with the clarity required by Missouri v. Hunter, supra, 459 U.S. at 368-69, 103 S.Ct. at 679, 74 L.Ed.2d at 542 (requiring that a legislature “specifically authorize[] cumulative punishment” under the statute).
In addition, we are constrained by the rule that where the legislative intent is unclear, the United States Supreme Court “has steadfastly insisted that ‘doubt will be resolved against turning a single transaction into multiple offenses.’ ” Simpson v. United States, 435 U.S. 6, 15, 98 S.Ct. 909, 914, 55 L.Ed.2d 70, 75 (1978) (citing Bell v. United States, 349 U.S. 81, 84, 75 S.Ct. 620, 622, 99 L.Ed. 905 (1955)). Accordingly, we conclude that the non-merger language in Section 7 does not sufficiently evidence a clear legislative intent to authorize multiple punishment for related convictions under Section 5 and Section 7.
We proceed to the Blockburger test to determine whether the statute unconstitutionally authorizes multiple punishment for the “same” offense. Under Blockburger, two offenses are the “same” unless “each [offense] requires proof of an additional [51]*51fact [that] the other does not.” Blockburger, supra, 284 U.S. at 304, 52 S.Ct. at 182, 76 L.Ed. at 309. The language of the school-zone statute provides that “[a]ny person who violates [N.J.S.A. 2C:35-5] * * * while on any school property * * * or within 1,000 feet of such school property * * * is guilty of a crime of the third degree.” N.J.S.A. 2C:35-7. We note that Section 7 requires proof of a fact not required to be proved under Section 5, that the offense occurred on or within 1,000 feet of school property. However, because the State must prove all elements of a Section 5 offense in order to establish a violation of Section 7, the Section 5 offense obviously does not require proof of any additional facts beyond those that establish a violation of the school-zone statute. We must therefore conclude that the two offenses are “the same” for purposes of the Blockburger analysis, thereby precluding multiple punishments under both Section 5 and the school-zone statute. Cf. Illinois v. Vitale, 447 U.S. 410, 419-20, 100 S.Ct. 2260, 2267, 65 L.Ed.2d 228, 237-38 (1980) (double jeopardy bars subsequent prosecution if one offense is always a necessary element of the other); Churchdale Leasing, supra, 115 N.J. at 106-07, 557 A.2d 277 (multiple punishment violates double jeopardy when the evidence that proves one offense necessarily establishes the other); Dively, supra, 92 N.J. at 582-83, 458 A.2d 502 (double jeopardy bars multiple convictions when evidence that proves one offense also establishes the other). Thus, federal double-jeopardy principles lead inevitably to the conclusion that to allow multiple punishments for related convictions under Section 5 and Section 7 of the Act is constitutionally impermissible.
New Jersey’s statutory provision governing convictions for related offenses is consistent with that analysis. That provision, N.J.S.A. 2C:1-8, provides that a defendant may not be convicted of more than one offense if “one offense is included in the other.” N.J.S.A. 2C:1-8(a)(1). That occurs when “[i]t is established by proof of the same or less than all the facts required to establish the commission of the offense charged.” [52]*52N.J.S.A. 2C:1-8(d)(1). Under that statutory standard, Section 5 would be an offense “included” within Section 7, because it is established by proof of the same facts as a Section 7 offense. Thus, the Code of Criminal Justice would also prohibit multiple convictions for related Section 5 and Section 7 offenses were it not for the express provision in Section 7 excluding the merger bar from the restrictions of N.J.S.A. 2C:1-8.
Ill
We need not invalidate the school-zone statute on constitutional grounds, however, if the non-merger language can be understood in a manner that would be consistent with constitutional principles. As we said in Profaci, supra, 56 N.J. at 350, 266 A.2d 579, “[e]ven though a statute may be open to a construction which would render it unconstitutional or permit its unconstitutional application, it is the duty of this Court to so construe the statute as to render it constitutional if it is reasonably susceptible to such interpretation.” Accord State v. LeFurge, 101 N.J. 404, 423, 502 A.2d 35 (1986); Town Tobacconist v. Kimmelman, 94 N.J. 85, 104, 462 A.2d 573 (1983). In determining whether a statute is susceptible to a construction that sustains its constitutionality, our primary focus must be on whether the Legislature would prefer the statute to survive as construed. Right to Choose v. Byrne, 91 N.J. 287, 311, 450 A.2d 925 (1982); New Jersey Bd. of Higher Educ. v. Board of Directors of Shelton College, 90 N.J. 470, 478, 448 A.2d 988 (1982); Schmoll v. Creecy, 54 N.J. 194, 202, 254 A.2d 525 (1969). That leads us to consider further the legislative intent underlying the school-zone statute.
We have observed that a primary objective of the school-zone statute is to impose a mandatory sentence on a defendant who commits a Section 5 violation in a school zone, and to assure that the mandatory sentence would survive the merger of a school-zone offense with a Section 5 offense that did not carry a mandatory minimum. Gonzalez, supra, 123 N.J. at 464, 588 [53]*53A.2d 816 (citing Gonzalez, supra, 241 N.J.Super. at 99-108, 574 A.2d 487 (Skillman, J., dissenting)). The school-zone statute is an important feature of New Jersey’s Comprehensive Drug Reform Act of 1986, L.1987, c. 101, enacted to combat drug use and distribution and reflecting the Legislature’s intention to impose heavy penalties on drug offenders. New Jersey Supreme Court Task Force on Drugs and the Courts, April 1991 at 5. In promulgating the school-zone statute, the Legislature intended to keep school zones drug-free in order that schools can effectively educate children about the dangers of drug use. Official Commentary to the Comprehensive Drug Reform Act, L.1987, c. 106.
The mandatory sentence associated with the school-zone offense is of particular significance. In prohibiting the merger of convictions for Section 7 offenses with convictions for related Section 5 offenses, the Legislature’s apparent concern was to assure the preservation of the period of parole ineligibility deemed essential to the school-zone statute. Accordingly, the commentary accompanying the school-zone statute states in part that
[p]unishment for violation of this section [of the school-zone statute], moreover, does not merge for sentencing purposes with punishment imposed for the underlying violation of N.J.S.A. 2C:35-5a, since this section responds to a separate and distinct danger apart from drug distribution generally * * *. This provision is thus designed to ensure the imposition of the mandatory term of imprisonment * * *.
[Official Commentary to the Comprehensive Drug Reform Act, ¿.1987, c. 101 (emphasis added).]
The official commentary specifically noted that the mandatory minimum sentence should be preserved “even where the defendant was convicted of a second degree offense.” Ibid. Other sources of the school-zone statute’s legislative history also reflect the concern that a person convicted under the school-zone statute be sentenced to a mandatory minimum term of imprisonment. S. 2449, Statement to Senate, p. 2 (July 29, 1986); N.J.Senate Law, Public Safely and Defense Committee, Statement to S. 2449, p. 1 (Aug. 13, 1986); N.J.Assembly [54]*54Judiciary Committee, Statement to S. 2449, p. 1 (Dec. 8, 1986). As one commentator observed, “although the section theoretically creates a separate offense, its real function is to require a minimum term as part of the sentence of certain offenders who would normally be prosecuted under 2C:35-5.” John M. Cannel, New Jersey Criminal Code Annotated, Comment 3 to N.J.S.A. 2C:35-7 at 555 (1991). The evidence quite compellingly demonstrates that the primary objective of Section 7’s non-merger provision was to insure that those who distribute drugs within a school zone receive the mandatory minimum sentence prescribed by Section 7. Further, the Drug Enforcement and Demand Reduction (DEDR) penalties, N.J.S.A. 2C:35-15, associated with a Section 5 conviction do not require a different result. Contrary to the position espoused by our dissenting colleagues, post at 61-62, 601 A.2d at 1158-1159, not one word of the legislative history underlying Section 7 suggests that Section 7’s non-merger provision was inspired by a legislative determination to preserve separate DEDR penalties. Accordingly, we conclude that that legislative purpose is reconcilable with a construction of Section 7’s no-merger provision that permits merger of Section 7 offenses into first- or second-degree Section 5 offenses as long as the period of parole ineligibility mandated by Section 7 is preserved.
Although in Gonzalez we required the merger of the defendant’s third-degree Section 5 conviction into his Section 7 conviction, we cannot apply that procedure to these offenses. To do so would achieve the anomalous result of merging a first- or second-degree Section 5 violation into a third-degree school-zone violation. See State v. Hammond, 231 N.J.Super. 535, 545, 555 A.2d 1169 (App.Div.) (crime of greater degree or culpability cannot merge into crime of lesser degree or culpability), certif. denied, 117 N.J. 636, 569 A.2d 1336 (1989). We recognize that ordinarily the offense with fewer elements would merge into the offense with greater elements. We depart from that principle in this case because the offense with fewer elements is [55]*55more severe, and we assume that the Legislature would prefer that that conviction survive.
We base our decision on a construction that effectuates the legislative intent and simultaneously avoids the constitutional issue posed by non-merger. Accordingly, we hold that the school-zone statute must be construed to allow merger of school-zone offenses into first- and second-degree Section 5 offenses provided that a defendant convicted of a drug offense in a school zone is sentenced to no less than the mandatory minimum sentence provided in the school-zone statute. We acknowledge an apparent inconsistency in preserving the mandatory minimum sentence authorized by Section 7 in the context of our holding that the Section 7 conviction must merge into the Section 5 conviction. That result, however, reflects the Legislature’s clear intent to impose an enhanced punishment for those who violate Section 5 while in a school zone. Thus, Section 5 should be construed and understood to require imposition of Section 7’s mandatory minimum term as part of the sentence imposed on any defendant convicted of a second-degree Section 5 offense and a related Section 7 offense; in respect of first-degree Section 5 convictions, the statute expressly provides for a mandatory minimum sentence.
The dissenting opinion’s statement that “the majority permits a heroin pusher in a school yard to receive no greater punishment than a heroin pusher in a high-crime area,” post at 56, 601 A.2d at 1156, is plainly inaccurate. As a result of the Court’s holding today, a defendant who committed a second-degree Section 5 offense in a school zone would be subject to the legislatively-mandated sentence enhancement; a defendant who committed the same crime outside a school zone would not be subject to such punishment. In addition, a defendant who committed a first-degree Section 5 offense in a school zone would be subject to the mandatory minimum imposed by that section, the identical punishment that would be imposed under the dissent’s formulation, if, as is usually the case, the sentences are imposed concurrently. See Yarbough, supra, 100 [56]*56N.J. at 643-44, 498 A.2d 1239. We note that the Legislature has previously enacted other sentencing schemes that reflect its purpose to impose enhanced sentences in order to deter criminal activity that poses a special risk to society. See N.J.S.A. 2C:43-6(c) (Graves Act requires imposition of mandatory minimum sentence for convictions of certain crimes committed with firearm). We conclude that the legislative purpose in enacting the school-zone statute can best be served, consistent with double-jeopardy principles, by requiring merger of Section 7 convictions into related first- or second-degree Section 5 convictions and construing Section 5 and Section 7 to require that any sentence imposed on a defendant convicted of Section 5 offenses within a school zone must include a mandatory minimum sentence no less severe than that set forth in Section 7 of the Act.
The judgment of the Appellate Division is affirmed.