WAHL, Justice.
This opinion is substituted for the opinion filed on October 20, 1978, which is -hereby withdrawn. Except as indicated in this opinion, the petition for rehearing is denied.
This is an appeal from a judgment of the district court of Olmsted County finding defendant, Boston Paul Vail, guilty of the sale and possession of a controlled substance, marijuana. The defendant challenges the sufficiency of the evidence identifying the seized contraband as a Schedule I controlled substance, and generally challenges, on equal protection grounds, the classification of marijuana in Schedule I.1 We find no such constitutional infirmity in the classification of marijuana as a Schedule I controlled substance; but, because the evidence considered by the trial court was insufficient to support the verdict, we reverse and order judgment of acquittal.
The essential facts of the transaction leading to appellant’s arrest were not disputed and can be simply stated; In January 1976, agent Gregory Sickler of the Minnesota Bureau of Criminal Apprehension (hereafter “M.B.C.A.”) contacted Mark Ro-sasco to arrange the purchase of a quantity of marijuana. Rosasco, in turn, agreed to contact a third party, whom he identified only as “Paul.” After a series of negotiations among the parties, it was agreed that Rosasco would purchase approximately 225 pounds of marijuana from “Paul” and immediately transport and resell it to agent Sickler. On February 2, 1976, the transaction was carried out, and Rosasco was arrested during the sale to Sickler.2 Rosasco declined to lead M.B.C.A. agents to his supplier at the time of his arrest, but did identify the defendant as the supplier.
Rosasco’s testimony at trial was corroborated by records of telephone calls between defendant and himself; by testimony of M.B.C.A. agents Harold Holden and Richard Stutz and Wabasha County Sheriff Roger Meurer, who were maintaining aerial and ground surveillance of Rosasco’s movements on the day of the transactions; and by testimony of Thomas Best, who encountered defendant immediately after his transaction with Rosasco and was told by the defendant that he had left, 225 pounds of marijuana in the trunk of Rosasco’s car.
On May 10, the defendant was arrested pursuant to a criminal complaint charging him with the sale and delivery of a controlled substance. Defendant moved to dismiss the complaint on July 26, 1976, on the [130]*130grounds that the classification of marijuana as a Schedule I controlled substance was unreasonable, arbitrary, and without rational relationship to a permissible state objective. The motion was heard September 23, 1976, and subsequently denied.
Defendant executed a written waiver of his right to a jury trial, and the matter was tried to the court. In addition to the facts set out above, the court heard expert testimony from Anne Rummel, a chemist with the Minnesota Bureau of Criminal Apprehension, and Dr. Marc G. Kurzman, who has extensive training in pharmacology, botany, and chemistry. Rummel concluded on the basis of the microscopic, the Duquenois-Le-vine, and the thin layer chromatography tests that the substance involved was marijuana. She also testified that as far as she knew, the genus, Cannabis, was monotypic. Professor Kurzman’s testimony challenged the specificity of the three standard tests and supported a finding that the genus Cannabis was polytypic. On December 7, 1976, the trial court filed findings of fact, conclusions of law, and determination of guilt, together with a memorandum which incorporated by reference the following determinations:
1. Cannabis is polytypic, not monotypic, or at least doubts about the matter must be resolved in favor of the defendant. The state must, therefore, prove that the substance involved was Cannabis sativa L., as distinguished from Cannabis ruderalis or Cannabis indica.
2. The Duquenois-Levine test and thin layer chromatography are only screening tests not adequately specific to identify marijuana.
3. Microscopic analysis, when combined with gas chromatography-mass spectroscopy, is capable of identifying marijuana beyond a reasonable doubt, but that test was not used in this case.
4. The scientific tests used, while not determinative, are highly probative. When coupled with the defendant’s representations, the quantity and price of the sale, and the assumed sophistication of the seller in identifying the product, the tests and practical inferences satisfy the state’s burden of proof.
Defendant’s appeal raises two primary issues: whether the evidence was sufficient to establish the identity of the substance seized, and whether Minnesota’s controlled substance classification scheme violates constitutional equal protection guarantees. The first issue has two parts: the precise “identity” which must be established, and the adequacy of the scientific and inferential evidence introduced to that end.
1. The multiple species question.
The issue of the sufficiency of the evidence to identify the contraband as a controlled substance initially requires a determination of the breadth of the statutory definition: “ ‘Marijuana’ means all parts of the plant Cannabis sativa L., including all agronomical varieties * * *.” Minn.St. 152.01, subd. 9. At trial, defendant contended that the definition was technical, unambiguous, and to be strictly construed. Introducing considerable botanical evidence that the plant genus Cannabis was polytypic, the defendant argued that the state must prove beyond a reasonable doubt that the substance is Cannabis sativa L., rather than, e. g., Cannabis ruderalis or Cannabis indica. The trial judge accepted defendant’s position:
“The Minnesota Statute still uses the term Cannabis sativa L. rather than simply Cannabis; therefore, I conclude that the Minnesota Statute seems to make illegal the possession of the one form of Cannabis and probably not make illegal possession of the other two species: Cannabis ruderalis and Cannabis indica.”
We disagree. It is not necessary to review all the taxonomic literature on the monotypic/polytypic Cannabis debate.3 [131]*131See, United States v. Rothberg, 351 F.Supp. 1115 (E.D.N.Y.1972), affirmed, 480 F.2d 534 (2 Cir. 1973), certiorari denied, 414 U.S. 856, 94 S.Ct. 159, 38 L.Ed.2d 106 (1973). The interpretation of a statute is a matter of law, not science; the proscription of marijuana, after all, is directed to the public at large and not to botanists alone. While we subscribe strongly to the principle that penal statutes must be strictly construed against the government, Ferch v. Victoria Elevator Co., 79 Minn. 416, 418, 82 N.W. 678 (1900), narrow application of the definition in issue would create serious anomalies and constitutional problems.
While there has been some recent evidence that not all Cannabis plants contain measurable amounts of tetrahydrocannabi-nols (THC),4 the active euphoric agent or intoxicant associated with marijuana, there is no scientific evidence that any of the species of the genus Cannabis lack THC. See, D. Bernheim, Defense of Narcotics Cases, § 4.04A at 4-36 (1975). THC is itself separately and specifically included as a Schedule I controlled substance. Minn.St. 152.02, subd. 2(3).
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WAHL, Justice.
This opinion is substituted for the opinion filed on October 20, 1978, which is -hereby withdrawn. Except as indicated in this opinion, the petition for rehearing is denied.
This is an appeal from a judgment of the district court of Olmsted County finding defendant, Boston Paul Vail, guilty of the sale and possession of a controlled substance, marijuana. The defendant challenges the sufficiency of the evidence identifying the seized contraband as a Schedule I controlled substance, and generally challenges, on equal protection grounds, the classification of marijuana in Schedule I.1 We find no such constitutional infirmity in the classification of marijuana as a Schedule I controlled substance; but, because the evidence considered by the trial court was insufficient to support the verdict, we reverse and order judgment of acquittal.
The essential facts of the transaction leading to appellant’s arrest were not disputed and can be simply stated; In January 1976, agent Gregory Sickler of the Minnesota Bureau of Criminal Apprehension (hereafter “M.B.C.A.”) contacted Mark Ro-sasco to arrange the purchase of a quantity of marijuana. Rosasco, in turn, agreed to contact a third party, whom he identified only as “Paul.” After a series of negotiations among the parties, it was agreed that Rosasco would purchase approximately 225 pounds of marijuana from “Paul” and immediately transport and resell it to agent Sickler. On February 2, 1976, the transaction was carried out, and Rosasco was arrested during the sale to Sickler.2 Rosasco declined to lead M.B.C.A. agents to his supplier at the time of his arrest, but did identify the defendant as the supplier.
Rosasco’s testimony at trial was corroborated by records of telephone calls between defendant and himself; by testimony of M.B.C.A. agents Harold Holden and Richard Stutz and Wabasha County Sheriff Roger Meurer, who were maintaining aerial and ground surveillance of Rosasco’s movements on the day of the transactions; and by testimony of Thomas Best, who encountered defendant immediately after his transaction with Rosasco and was told by the defendant that he had left, 225 pounds of marijuana in the trunk of Rosasco’s car.
On May 10, the defendant was arrested pursuant to a criminal complaint charging him with the sale and delivery of a controlled substance. Defendant moved to dismiss the complaint on July 26, 1976, on the [130]*130grounds that the classification of marijuana as a Schedule I controlled substance was unreasonable, arbitrary, and without rational relationship to a permissible state objective. The motion was heard September 23, 1976, and subsequently denied.
Defendant executed a written waiver of his right to a jury trial, and the matter was tried to the court. In addition to the facts set out above, the court heard expert testimony from Anne Rummel, a chemist with the Minnesota Bureau of Criminal Apprehension, and Dr. Marc G. Kurzman, who has extensive training in pharmacology, botany, and chemistry. Rummel concluded on the basis of the microscopic, the Duquenois-Le-vine, and the thin layer chromatography tests that the substance involved was marijuana. She also testified that as far as she knew, the genus, Cannabis, was monotypic. Professor Kurzman’s testimony challenged the specificity of the three standard tests and supported a finding that the genus Cannabis was polytypic. On December 7, 1976, the trial court filed findings of fact, conclusions of law, and determination of guilt, together with a memorandum which incorporated by reference the following determinations:
1. Cannabis is polytypic, not monotypic, or at least doubts about the matter must be resolved in favor of the defendant. The state must, therefore, prove that the substance involved was Cannabis sativa L., as distinguished from Cannabis ruderalis or Cannabis indica.
2. The Duquenois-Levine test and thin layer chromatography are only screening tests not adequately specific to identify marijuana.
3. Microscopic analysis, when combined with gas chromatography-mass spectroscopy, is capable of identifying marijuana beyond a reasonable doubt, but that test was not used in this case.
4. The scientific tests used, while not determinative, are highly probative. When coupled with the defendant’s representations, the quantity and price of the sale, and the assumed sophistication of the seller in identifying the product, the tests and practical inferences satisfy the state’s burden of proof.
Defendant’s appeal raises two primary issues: whether the evidence was sufficient to establish the identity of the substance seized, and whether Minnesota’s controlled substance classification scheme violates constitutional equal protection guarantees. The first issue has two parts: the precise “identity” which must be established, and the adequacy of the scientific and inferential evidence introduced to that end.
1. The multiple species question.
The issue of the sufficiency of the evidence to identify the contraband as a controlled substance initially requires a determination of the breadth of the statutory definition: “ ‘Marijuana’ means all parts of the plant Cannabis sativa L., including all agronomical varieties * * *.” Minn.St. 152.01, subd. 9. At trial, defendant contended that the definition was technical, unambiguous, and to be strictly construed. Introducing considerable botanical evidence that the plant genus Cannabis was polytypic, the defendant argued that the state must prove beyond a reasonable doubt that the substance is Cannabis sativa L., rather than, e. g., Cannabis ruderalis or Cannabis indica. The trial judge accepted defendant’s position:
“The Minnesota Statute still uses the term Cannabis sativa L. rather than simply Cannabis; therefore, I conclude that the Minnesota Statute seems to make illegal the possession of the one form of Cannabis and probably not make illegal possession of the other two species: Cannabis ruderalis and Cannabis indica.”
We disagree. It is not necessary to review all the taxonomic literature on the monotypic/polytypic Cannabis debate.3 [131]*131See, United States v. Rothberg, 351 F.Supp. 1115 (E.D.N.Y.1972), affirmed, 480 F.2d 534 (2 Cir. 1973), certiorari denied, 414 U.S. 856, 94 S.Ct. 159, 38 L.Ed.2d 106 (1973). The interpretation of a statute is a matter of law, not science; the proscription of marijuana, after all, is directed to the public at large and not to botanists alone. While we subscribe strongly to the principle that penal statutes must be strictly construed against the government, Ferch v. Victoria Elevator Co., 79 Minn. 416, 418, 82 N.W. 678 (1900), narrow application of the definition in issue would create serious anomalies and constitutional problems.
While there has been some recent evidence that not all Cannabis plants contain measurable amounts of tetrahydrocannabi-nols (THC),4 the active euphoric agent or intoxicant associated with marijuana, there is no scientific evidence that any of the species of the genus Cannabis lack THC. See, D. Bernheim, Defense of Narcotics Cases, § 4.04A at 4-36 (1975). THC is itself separately and specifically included as a Schedule I controlled substance. Minn.St. 152.02, subd. 2(3). Thus, if the definition of marijuana were held to exclude species other than Cannabis sativa L., those species would not be left in a statutory limbo but would still be proscribed, as “ * * * material * * * which contains * * * tetrahydrocannabinols.”5 Minn.St. 152.02, subd. 2(3). Moreover, excluded species would not qualify for the lesser penalties given “marijuana” offenders. Minn.St. 152.15, subd. 1(5); subd. 2(2), (5); subd. 2a; subd. 4. The result is an enforcement scheme which provides major differences in penalties for abuse of different species of the genus Cannabis, species which are almost impossible to distinguish visually or even miscroscopically once fragmented and/or dried.6 See, Fullerton & Kurzman, the Identification and Misidentification of Marijuana, 3 Contemp. Drug Prob. Q. 291. Such a scheme presents obvious equal protection and due process (fair notice) problems. See, People v. Van Alstyne, 46 Cal. App.3d 900, 913, 121 Cal.Rptr. 363, 371 (1975), certiorari denied, 423 U.S. 1060, 96 S.Ct. 798, 46 L.Ed.2d 652 (1976); see, also, United States v. Walton, 168 U.S.App.D.C. 305, 306, 514 F.2d 201, 202 (1975). The unreasonable consequences of narrow application of the definition requires closer examination of legislative intent. State v. Carroll, 225 Minn. 384, 386, 31 N.W.2d 44, 45 (1948).
In 1953, the legislature added “Cannabis” to the definition of narcotic drugs, and stated that the term “includes all parts of the plant Cannabis Sativa L.” Laws 1953, c. 431, §§ 1, 2. It is apparent from this language that the legislation reflected the general consensus among botanists that Cannabis was monotypic. See, United States v. Moore, 330 F.Supp. 684, 686 (E.D.Pa.1970), affirmed, 446 F.2d 448 (3 Cir. 1971), certiorari denied 406 U.S. 909, 92 S.Ct. 1617, 31 L.Ed.2d 820 (1971); United States v. Rothberg, 351 F.Supp. 1115, 1118 (E.D.N.Y. 1972).
In 1970, the Federal Bureau of Narcotics and Dangerous Drugs drafted legislation approved by the National Conference of Commissioners on Uniform State Laws as the Uniform Controlled Substances Act. Minnesota adopted much of the new uniform act, including the definition of “marijuana” in issue in this appeal. L.1971 c. 937, § 4. Although there had been scientif[132]*132ic studies questioning the monotypic categorization,7 it was generally assumed by the lay and legal community that there was but one species of marijuana subject to agro-nomical variation, i. e., differences attributable to climatic conditions.8 The definition reflects a general legislative intent to regulate all species of the genus Cannabis, and we so hold.9 Thus, contrary to the assumption of the trial court, the state must only establish beyond a reasonable doubt the generic identity of the plant substance in issue; identification of the particular species is not relevant.
We are satisfied that our interpretation of Minn.St. 152.01, subd. 9, accurately reflects legislative intent since the major concern of the legislature, the morphological effects of use, are indistinguishable among the various species of Cannabis. Moreover, we are satisfied that our interpretation does not raise problems of adequate public notice. Identification of the species of Cannabis is irrelevant to the user and practically impossible in its common commercial forms. We think that members of the general public of common intelligence understand that the clandestine sale of marijuana, whatever the species, constitutes a crime. See People v. Van Alstyne, 46 Cal.App.3d 900, 917, 121 Cal.Rptr. 363, 374 (1975), certiorari denied, 423 U.S. 1060, 96 S.Ct. 798, 46 L.Ed.2d 652 (1976); United States v. Honneus, 508 F.2d 566, 575 (1 Cir. 1974) certiorari denied, 421 U.S. 948, 95 S.Ct. 1677, 44 L.Ed.2d 101 (1975).
[133]*133Nevertheless, in the interest of clarity, the legislature might wish to consider the example set by the several states who have recently revised their definition of marijuana to include “all species of the genus Cannabis.” 10'
2. Identification of the contraband.
The state introduced scientific and non-scientific evidence to identify the material seized at the Rosasco arrest. M.B.C.A. chemist, Anne Rummel, M.B.C.A. agent Sickler, and witness Rosasco testified to initial, gross, visual identification of the substance. Sickler stated that he observed M.B.C.A. agent Paul Gerber perform a Val-tox field identification at the time the material was seized, with positive results. Rummel then testified that three separate laboratory tests—microscopic identification, Duquenois-Levine, and thin layer chromatography—were performed upon each of the eight random samples, with consistently positive findings.
The defendant sought to undermine the probative impact of this evidence, pointing out the limited qualifications of the laymen to make visual identifications, and that Rummel did not have sufficient botanical training to make a conclusive microscopic identification. Moreover, reagents used in the Duquenois-Levine test were not tested to assure identity or purity; there was no notation regarding the atmosphere saturation in the thin layer chromatography test tank, nor were the plate or a vapor sample preserved. Finally, the failure to purify the samples prior to testing left the possibility that combinations of naturally-occurring substances had contaminated the samples and given misleading results.
The trial judge properly admitted the evidence and considered defendant’s objections in determining its weight. He concluded that this evidence, alone, was insufficient to identify the substance beyond a reasonable doubt:
“The defendants in this case have submitted testimony and persuasive arguments to the effect that the combination of screening tests in this particular case, and the combination of screening tests in general, does not afford the kind of identification that is needed in the criminal law and does not amount to a proof beyond a reasonable doubt that the • substance is declared to be the controlled substance.
“I have listened to this testimony for more than a half a day. I have reviewed some of the literature and the law on the subject, and I am persuaded, that at least in a case where there is possession of a controlled substance with the intent to sell, that the identification procedures are probably inadequate.” (Emphasis in original).
Whether this court would draw the same conclusion from the evidence is not relevant; our role as a reviewing court is limited. The trial before Judge Olson was held following defendant’s written and informed waiver of his right to a jury. Under those circumstances, the judge’s findings of fact are entitled to the same weight on review as a jury verdict. State v. Mytych, 292 Minn. 248, 252, 194 N.W.2d 276, 279 (1972); State v. Crosby, 277 Minn. 22, 24, 151 N.W.2d 297, 299 (1967). Such findings will not be set aside unless clearly erroneous. State v. Knox, Minn., 250 N.W.2d 147, 154 (1976). These findings of fact are therefore upheld.
The trial court went on to consider “inferences identifying the substance from nonscientific evidence.” Four additional facts were considered:
“1. The amount of the sale amounting to 220 pounds.
“2. The sale price amounting to $120 per pound.
“3. The statement of the Defendant Vail quoted by the State’s witness Mr. Rosasco identifying the product as not only marijuana, but identifying the product as ‘Mexican grade’ marijuana.
[134]*134“4. The inferred fact, which this Court makes, that a seller of a product containing 220 pounds is probably sophisticated and competent and alert enough to have made his own tests before he himself bought the product for presumably a considerable sum of money from his supplier. Whether that task was simply smoking the product in order to test the substance or whether the product was otherwise analyzed is, of course, unknown to the Court.”
We have not prescribed minimum eviden-tiary requirements in identification cases, preferring to examine the sufficiency of the evidence on a case-by-case basis. See, e. g., State v. Dick, Minn., 253 N.W.2d 277 (1977); State v. Boyum, 293 Minn. 482, 197 N.W.2d 218 (1972). In this case, we do not believe that the additional considerations relied upon by the trial court are sufficient to support its determination of guilt. Minnesota law requires proof of the actual identity of the substance, the defendant’s belief is not sufficient. State v. Dick, Minn., 253 N.W.2d 277, 279 (1977). The price charged and representations made by the defendant are, at best, only assertions of his belief.
At trial, the state expressly abandoned its attempt to infer identity from quantity; we find no necessary relationship. Finally, the last “fact” listed, a commercial practice of testing among large-volume sellers, is wholly speculative and unsupported by the evidence. Rosasco and Sickler both testified that no part of the material in issue was ever burned or smoked.11 On the facts of this case, we conclude that the “additional factors” simply do not advance the state in satisfying its burden of proof, given the trial court’s skepticism of the scientific evidence. Because the trial court found that the scientific evidence was inadequate to prove beyond a reasonable doubt that the substance was Cannabis sativa L., and because four additional factors were impermissibly used to sustain the state’s burden of proof, we have found, in effect, that the evidence was insufficient to sustain the verdict. The double jeopardy clause bars a new trial. Burks v. United States, 437 U.S. 1, 98 S.Ct. 2141, 57 L.Ed.2d 1 (1978).
The second issue raised by the defendant is the equal protection challenge to the statutory classification of marijuana as a Schedule I controlled substance. Defendant acknowledges that the equal protection standard applicable in reviewing the Minnesota marijuana laws requires a demonstration that the classification is reasonable, not arbitrary, and bears a rational relationship to a permissible state objective. Village of Belle Terre v. Boraas, 416 U.S. 1, 94 S.Ct. 1536, 39 L.Ed.2d 797 (1974). Defendant argued and presented evidence at the hearing of his motion to dismiss and on appeal that the inclusion of marijuana within Schedule I controlled substances was both over-inclusive, since it satisfies none of the statutory criteria,12 and under-inclusive, since alcohol [135]*135and nicotine are not so classified although they in fact satisfy the statutory criteria.
Minnesota’s classification scheme is based on the 1970 Uniform Controlled Substances Act, which listed marijuana in Schedule I because little was known about its long-term effects.
“Congress listed marihuana in Schedule I principally on the recommendation of HEW, which urged ‘that marijuana be retained within Schedule I at least until the completion of certain studies now underway to’ -determine the physical and psychological dependency effects of the drug. See H.R. Report, supra, note 3, at 4579, 4629-30. Apparently the potential for abuse and the absence of significant medical value were the determining grounds for placement of marihuana in the first schedule. See 116 Cong.Rec. 797 (daily ed. Jan. 28, 1970) (remarks of Sen. Hruska).” United States v. Kiffer, 477 F.2d 349, 356 (2 Cir. 1973), certiorari denied sub nom., Harmash v. United States, 414 U.S. 831, 94 S.Ct. 165, 38 L.Ed.2d 65 (1973).
The intervening years have produced a growing body of scientific literature on the effects of marijuana on the human physiology and psychology,13 but marijuana has not been rescheduled by either the state legislature or the state board of pharmacy, acting under its statutory authority. Minn.St. 152.02, subd. 8. In response to growing public and scientific opinion against imposing Schedule I penalties on marijuana users, the legislature has repeatedly amended Minn.St. 152.15 to reduce penalties. L.1971, c. 937, § 17; L.1973, c. 693, §§ 10-13; L.1976, c. 42, §§ 1, 2.
It is apparent, then, that nominal inclusion of marijuana within Schedule I has little impact, since the classification is not a controlling factor in the scheme of punishment. See, People v. Morehouse, 80 Misc.2d 406, 364 N.Y.S.2d 108 (Sup.Ct.1975); United States v. Maiden, 355 F.Supp. 743 (D.Conn.1973). Thus, neither People v. McCabe, 49 Ill.2d 338, 275 N.E.2d 407 (1971), nor People v. Sinclair, 387 Mich. 91, 194 N.W.2d 878 (1972), which sustained equal protection challenges to classification of marijuana as a “narcotic drug” for purposes of penalties, are in point.14
[136]*136In view of the continued debate over possible short- and long-term physical and psychological effects, it cannot fairly be said that continued apprehension and reluctance of the state board of pharmacy to reschedule marijuana is so arbitrary and unreasonable as to render it unconstitutional.15
Similarly, the fact that Schedule I does not include all substances which arguably meet the statutory criteria is not constitutionally fatal. The legislature is not compelled to attempt to regulate all harmful substances merely because it attempts to regulate some. United States v. Kiffer, supra. See, also, McDonald v. Board of Election Commissioners, 394 U.S. 802, 809-811, 89 S.Ct. 1404, 22 L.Ed.2d 739 (1969); Williamson v. Lee Optical, Inc., 348 U.S. 483, 489, 75 S.Ct. 461, 99 L.Ed. 563 (1955).
Reversed and judgment of acquittal ordered.