Colorado Supreme Court Narrows the “Laced Drug” Defense: What People v. Mion Means for Involuntary Intoxication Cases

A 4–2 decision issued January 26, 2026 holds that when you knowingly consume an intoxicating product, the product itself—not each hidden ingredient—is the “substance” a court examines.

By H. Michael Steinberg · October 12, 2026 · Colorado Criminal Defense

Involuntary intoxication is an affirmative defense to all crimes, provided that the intoxication is not “self-induced.” CRS § 18-1-804(3). “Self-induced intoxication” occurs when a defendant “knowingly introduce[s]” substances that the defendant “knows or ought to know” cause intoxication. § 18-1-804(5).

The supreme court held that, when a defendant contends that there are multiple intoxicants in a product that they consumed, a “substance” per § 18-1-804(5) is the entire product, not each “particular intoxicant” within the product. Interpreting “substance” as the entire product allows courts to consider a defendant’s reasonableness under the “ought to know” prong of the statute and thus effectuates the legislature’s intent.

On January 26, 2026, the Colorado Supreme Court decided People v. Mion, 2026 CO 5, a 4–2 opinion that sharply limits when a defendant can claim “involuntary intoxication” after knowingly consuming one intoxicating product that allegedly contained something else. If you or someone you love is facing charges after ingesting something that may have been laced, this ruling changes how Colorado courts will analyze the defense.

The Short Answer

• When a defendant says a product he consumed contained multiple intoxicants, the “substance” under C.R.S. § 18-1-804(5) is the entire product, not each individual intoxicant inside it.
• The court then asks whether the defendant knowingly consumed the product and whether he knew or ought to have known it could intoxicate—a reasonableness question.
• On the facts in Mion, the Court held the defendant was voluntarily intoxicated as a matter of law, which barred the defense.
• The majority said a person whose drink is secretly spiked can still reach the defense through the statute’s “circumstances that would afford a defense” exception.

What Happened in Mion

According to the opinion, a security guard found Isaac Mion sleeping on the grounds of the Denver City and County Building. When asked to leave, he became agitated and erratic, grabbed the guard’s phone, and knocked a second guard’s phone from her hand, cracking the screen. He then struck a civilian’s truck with a club-like object and was arrested after trying to submerge himself in a creek. He was charged with aggravated robbery, menacing, and criminal mischief.

At trial, Mion testified that he had been drinking beer with a man he knew only as a “street guy,” accepted a joint from him, and took two hits. About twenty minutes later he felt paranoid, and he later blacked out.

He asked for a jury instruction on involuntary intoxication, arguing that “something unknown”—such as a stimulant—was in the joint. The trial court called the claim “pure speculation” and refused the instruction, and the jury convicted him of robbery, menacing, and criminal mischief.

A division of the Court of Appeals reversed in People v. Mion, 2023 COA 110M, holding that the defense applies when a person knowingly ingests one intoxicant, unknowingly ingests a different one, and the different one deprives him of the capacity to conform his conduct to the law.

The Supreme Court granted review and reversed.

The Statute at the Center of the Case

Self-induced intoxication has two parts.

The defendant must have (1) knowingly introduced the substance and (2) known, or ought to have known, that it tends to cause intoxication.

The first part is about actual awareness. The second, the Court explained, is a reasonableness standard: what a reasonable person would have known under the circumstances.

Why the Court Chose the “Entire Product” Reading

The Court found the word “substance” ambiguous and weighed the consequences of each reading. Under the Court of Appeals’ approach, it reasoned, a defendant could always say he did not “knowingly” take the hidden ingredient, so a court would never reach the “ought to know” prong—effectively erasing that language from the statute.

“…the entire product, not each ‘particular intoxicant’ within the product.”

— People v. Mion, 2026 CO 5, ¶ 24

The Court illustrated the point with brownies and drinks.

Here is how its examples line up:

The “Spiked Drink” Exception and Its Open Questions

The majority acknowledged the obvious concern: a person whose drink is secretly spiked is not the kind of defendant the ruling targets. It pointed to the final clause of § 18-1-804(5), which excludes substances introduced “under circumstances that would afford a defense to a charge of crime,” and tied that language to fraud or trickery, relying on commentary to the Model Penal Code provision on which the statute was modeled. Because Mion offered no evidence that the “something unknown” was introduced through trickery, the exception did not help him.

Both dissents questioned how that exception works in practice. Chief Justice Márquez wrote that it is unclear how a defendant could claim trickery if the relevant “substance” is the product he knowingly ingested, and Justice Hood asked what statutory defense a spiked-drink victim would actually plead. The Court also expressly declined to decide whether a defendant must show “innocent mistake” to raise the involuntary intoxication defense. Those questions remain open.

The Dissents

Chief Justice Márquez argued that the majority’s reading defies the statutory language and exposes “otherwise innocent people” to criminal liability. Her examples included an adult who responsibly drinks a single cocktail that was secretly spiked, and an adult who lawfully consumes legal recreational marijuana that was laced with a potent hallucinogen. She would also have held that Mion presented enough evidence to earn an instruction.

Justice Hood called the majority’s reading a plausible one and acknowledged the policy reasons behind it, but he would have treated the question of which substance caused the conduct as a factual one for the jury.

What This Means If You Are Charged

Every case turns on its facts. Based on the framework in Mion, these are the kinds of facts that can matter:

• How the substance was obtained. The Court stressed that Mion took the joint from an unknown person on the street rather than a licensed establishment, and never asked what it was.
• Source and context. Where a substance came from, who supplied it, and what the person was told can bear on whether he reasonably should have known it was intoxicating.
• Evidence of trickery. If a third party may have adulterated a drink or food, evidence of that act—witnesses, video, receipts, and testing, where available—becomes important under the statute’s exception.
• The “some credible evidence” threshold. A bare assertion is not enough. In People v. Williams, 2025 COA 26, which the Supreme Court discussed in Mion, the Court of Appeals rejected the defense where the defendant was already hallucinating before he took the drug he claimed was substituted.
• A clear record on the statute. Two justices read § 18-1-804 differently from the majority. A defense attorney should make a clear record on the statutory argument.

If you were intoxicated by something you did not know you were consuming, tell your attorney everything about where it came from, who was present, and what you were told. After Mion, those details are central to the analysis.

Why Experience Matters in Intoxication-Defense Cases

Intoxication defenses sit at the intersection of statutory interpretation, trial strategy, and the credibility of a client’s account. With over forty years of Colorado criminal defense experience in Colorado’s criminal courtrooms—including DUI, drug crimes, domestic violence, sex crimes, and felony and misdemeanor defense across the Denver metro area—the Law Office of H. Michael Steinberg can evaluate how decisions like Mion apply to your case. For more analysis, visit the Colorado Criminal Lawyer Blog.

Authorities Cited

• People v. Mion, 2026 CO 5, No. 24SC2 (Colo. Jan. 26, 2026)
• People v. Mion, 2023 COA 110M, 544 P.3d 111
• People v. Williams, 2025 COA 26, 568 P.3d 1267
• C.R.S. § 18-1-804 (intoxication)
• C.R.S. § 18-1-407 (affirmative defenses)

Disclaimer: This article is provided for general informational purposes only and is not legal advice. Reading it does not create an attorney-client relationship. Laws change, and every case depends on its own facts; consult a licensed Colorado attorney about your situation.