Christopher James Williams, appellant, was convicted, in a bench trial, of possessing a controlled drug not obtained by a valid prescription, in violation of Code § 18.2-250. On appeal, he contends: (1) the evidence was insufficient because the Commonwealth failed to prove he had no valid prescription to obtain the drug; (2) Code § 18.2-263, relied upon by the Commonwealth, is unconstitutionally vague because it fails to state a standard of proof for the accused to overcome the government’s burden of proof; and (3) that Code § 18.2-263 violates his due process rights by shifting the Commonwealth’s burden to appellant to prove his innocence. For the reasons stated, we affirm the trial court’s judgment.
BACKGROUND
Appellant was in possession of three pills, each containing Oxycodone and Acetaminophen. The preparation is a Schedule II prescription drug. The shape, color, and manufacturer’s markings of the pills were consistent with a pharmaceutical prescription.
Appellant did not contest that he possessed the pills. He filed a pretrial motion to dismiss the charge, arguing that Code § 18.2-263 was unconstitutional. 1 The Commonwealth *346 argued the existence of a valid prescription was an affirmative defense, rather than an element of the offense. The trial court found the statute constitutional and denied appellant’s motion to dismiss. Other than the provisions of Code § 18.2-263, the Commonwealth produced no evidence that appellant did not possess a valid prescription. Appellant argues the absence of a valid prescription is an element of the offense and must be proved by the Commonwealth.
ANALYSIS
On appeal, appellant challenges the constitutionality of Code § 18.2-263 on two grounds. First, appellant contends the statute is unconstitutionally vague because it fails to state a standard of proof required for him to prove he had a valid prescription. Second, he argues the statute violates the Due Process Clause of both the United States and Virginia Constitutions by shifting the burden to appellant to prove his innocence. Appellant, assuming the statute is unconstitutional, then challenges the sufficiency of the evidence, because without the benefit of Code § 18.2-263, the Commonwealth did not prove he had no valid prescription to possess the pills. As the constitutionality of Code § 18.2-263 is dispositive of the sufficiency argument, we will first address the constitutionality of that statute.
Vagueness
Appellant notes that while Code § 18.2-263 allocates the burden of proof to the accused to prove he had a valid prescription, it does not indicate whether that burden is by preponderance of the evidence, or beyond a reasonable doubt. Appellant concludes a person of ordinary intelligence would *347 not know what standard of proof is required. Therefore, he posits, this ambiguity could encourage arbitrary and discriminatory enforcement.
The Commonwealth responds that because appellant never argued this issue to the trial court and because the trial court never ruled on the vagueness issue, we cannot review this argument. 2 We agree.
Because appellant did not obtain a ruling from the trial court on his pretrial motion, “there is no ruling for [this Court] to review” on appeal, and his argument is waived under Rule 5A:18.
Fisher v. Commonwealth,
Although Rule 5A:18 contains exceptions for good cause or to meet the ends of justice, appellant does not argue these exceptions and we will not invoke them
sua sponte. See Edwards v. Commonwealth,
Because there was no ruling on the vagueness argument, the argument is waived and we will not consider it on appeal. 3
Due Process
Appellant also contends that Code § 18.2-263 impermissively shifts the Commonwealth’s burden of proof to him, violating the Due Process Clause of the United States and Virginia Constitutions.
*348
On appeal, we review arguments regarding the constitutionality of a statute
de novo. Shivaee v. Commonwealth,
“This presumption is ‘one of the strongest known to the law.’ ”
Boyd v. County of Henrico,
Due process requires the prosecution “to prove beyond a reasonable doubt every fact necessary to constitute the crime charged.”
Mullaney v. Wilbur,
In order to resolve whether there is a due process violation in this case, we first must address the threshold issue of whether the absence of a valid prescription is an affirmative defense or a negative element of the offense. If it is the latter, the burden of proof is on the Commonwealth, and it cannot be shifted to the accused.
*349
It is a familiar principle of law that ambiguous penal statutes must be strictly construed against the Commonwealth.
Stevenson v. City of Falls Church,
Mayhew also notes:
When construing penal statutes which contain qualifications, exceptions or exemptions to their application, the limiting language may be viewed as a negative element of the offense which the prosecution must disprove. Alternately, the court may determine that the exemption is a statutory defense, which the accused can assert to defeat the prima facie case of the prosecution. Regular Veterans [Association, Ladies Auxiliary v. Commonwealth ], 18 Va.App. [683,] 688, 446 S.E.2d [621,] 624 [ (1994) ] (... [The accused bears] the burden of producing evidence [of the negation of circumstances] sufficient to raise a reasonable doubt of [his] guilt).
In determining whether specific limiting language is an element of the offense or a statutory defense, a court should look both to the intent of the statute as a whole and the ability of the respective parties to assert the existence or absence of the underlying facts sustaining the applicability of the limitation. Accordingly, we should consider *350 the wording of the exception and its role in relation to the other words in the statute; whether in light of the situation prompting legislative action, the exception is essential to complete the general prohibition intended; whether the exception makes an excuse or justification for what would otherwise be criminal conduct, i.e., sets forth an affirmative defense; and whether the matter is peculiarly within the knowledge of the defendant.
Commonwealth v. Stoffan [228 Pa.Super. 127 ],323 A.2d 318 , 324 (Pa.Super.Ct.1974); See also State v. Williamson [58 Wis.2d 514 ],206 N.W.2d 613 , 618 (Wis.1973) (It is undoubtedly the general rule that the state must prove all the essential facts entering into the description of the offense. But it has been held in many cases that when a negation of a fact lies peculiarly within the knowledge of the defendant it is incumbent on him to establish that fact).
Id.
at 489-90,
The Supreme Court of Virginia, in
Stillwell v. Commonwealth,
In its enactment of The Drag Control Act the General Assembly recognized that, except in very rare and most unusual cases, there can be no lawful possession, sale or distribution of drags by anyone, particularly of those drags classified in Schedules I, II and III.... With few exceptions, enumerated by statute, no one can lawfully manufacture, possess, sell or distribute such drags____ The possession of drags is confined to a small group of professionals who are required to dispense the drags under restricted and controlled conditions. By and large, it can be said that the lawful possession of drugs is restricted to licensed manufacturers, licensed pharmacists, and to individuals who have possession as a result of a prescription given by an authorized physician. *351 The General Assembly recognized that seldom, if ever, except in these authorized instances, could there be any explanation for the sale or possession of drugs.
Clearly, the legislature intended for Virginia’s drug laws to rigorously limit possession of Schedule I, II, and III controlled substances.
We next observe that the “valid prescription” exemption of Code § 18.2-250 relates to a fact that would be solely within the knowledge of the accused. If we accept appellant’s contention that the Commonwealth must prove appellant had no valid prescription, the offense would be virtually unprovable. Under appellant’s theory, to obtain a conviction under the facts of this case, the Commonwealth would be required to prove that no medical professional, wherever located, in this Commonwealth or elsewhere, had prescribed the drug to appellant. This would involve a nationwide search of chain drugstores, as well as independent pharmacies, hospitals, prison infirmaries, etc. Appellant, at oral argument, conceded that such an undertaking would most likely be impossible. The General Assembly clearly did not intend such a result, nor would they enact such an impotent statute.
While we acknowledge the requirement that we strictly construe ambiguous penal statutes against the Commonwealth,
Welch v. Commonwealth,
Under well-settled law, “‘the burden is on the Commonwealth to prove every essential element of the offense beyond a reasonable doubt.’ ”
Bishop v. Commonwealth,
275
*352
Va. 9, 12,
“An affirmative defense,” however, raises “a separate issue which may carry a separate burden of proof.” Ronald J. Bacigal,
Criminal Procedure
§ 17.28 (2007-2008 ed.). It is well settled that a criminal defendant may be required to bear all or part of the burden in establishing an affirmative defense “once the facts constituting a crime are established beyond a reasonable doubt....”
New York v. Patterson [Patterson v. New York],
In Virginia, a criminal defendant typically bears the burden of “producing evidence in support of [an affirmative defense] sufficient to raise a reasonable doubt of [his or her] guilt.”
Regular Veterans Assoc., Ladies Auxiliary v. Commonwealth,
Tart v. Commonwealth,
Under the
Mayhew
criteria, we hold that requiring the Commonwealth to prove this negative would undermine the general prohibition intended by the legislature. The exception, i.e. a valid prescription, justifies what would otherwise be criminal conduct. The presence of a valid prescription is “peculiarly within the knowledge of the [appellant].”
Mayhew,
People v. Pegenau,
A person shall not knowingly or intentionally possess a controlled substance or an official prescription form or a prescription form unless the controlled substance, official prescription form, or prescription form was obtained directly from, or pursuant to, a valid prescription or order of a practitioner while acting in the course of the practitioner’s professional practice....
Id. at 333-34 (emphasis omitted).
The Supreme Court of Michigan held that “the operative words defining the elements of the crime are ‘A person shall not knowingly or intentionally possess a controlled substance .... ’ The language concerning a prescription or other authorization refers to an exemption rather than an element of the crime.”
Id.
at 334. The
Pegenau
court referred to another Michigan case,
People v. Henderson,
Thus, the exception language in Code § 18.2-250 is not an element of the offense, but rather an affirmative defense. As a result, appellant was required to satisfy his burden of producing or pointing to evidence that would allow him to invoke the exception.
See Tart,
Sufficiency
Finally, appellant argues the evidence was insufficient to convict him of violating Code § 18.2-250, because without the *355 benefit of Code § 18.2-263, the Commonwealth failed to prove he did not have a valid prescription to possess the Schedule II controlled substances.
However, this argument rises or falls with the constitutionality of Code § 18.2-263. We have already determined that Code § 18.2-263 is valid. This conclusion disposes of appellant’s sufficiency argument. Appellant was properly convicted under Code § 18.2-250.
CONCLUSION
We find that Code § 18.2-263 is constitutional and does not impermissibly shift the burden of proof to appellant. The trial judge properly denied appellant’s motion to dismiss and convicted appellant, and we affirm that judgment.
Affirmed.
Notes
. Code § 18.2-250(A) provides in pertinent part:
It is unlawful for any person knowingly or intentionally to possess a controlled substance unless the substance was obtained directly from, or pursuant to, a valid prescription or order of a practitioner while acting in the course of his professional practice, or except as otherwise authorized by the Drug Control Act (§ 54.1-3400 et seq.). Code § 18.2-263 provides:
*346 In any complaint, information, or indictment, and in any action or proceeding brought for the enforcement of any provision of this article or of the Drug Control Act (§ 54.1-3400 et seq.), it shall not be necessary to negative any exception, excuse, proviso, or exemption contained in this article or in the Drug Control Act, and the burden of proof of any such exception, excuse, proviso, or exemption shall be upon the defendant.
. In his motion to dismiss, appellant raised the vagueness challenge but failed to argue vagueness before the trial court. The sole argument by appellant and the Commonwealth was the due process issue. The trial court, in denying the motion, did not address the vagueness issue.
. The Commonwealth argues appellant had no standing to argue vagueness since he was not injured by lack of the statute setting forth the standard of proof. As we have concluded this issue is waived, we need not address standing.
.
Tart
noted "there is no uniform rule in Virginia regarding the burden of persuasion for affirmative defenses.”
. While
Henderson
only applied to shifting the burden of production, the United States Supreme Court, in
Patterson v. New York,
