Which scenario constitutes involuntary intoxication?

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Involuntary intoxication happens when a person consumes an intoxicant without choosing to or without realizing what it is, so they don’t knowingly trigger the intoxicated state. The best illustration is taking something without knowledge of its nature—like being drugged or given a substance without realizing its effects. When the intoxication is truly involuntary, it can prevent the formation of the mental state required for the crime, potentially reducing or negating liability.

The other scenarios describe voluntary intoxication or ordinary circumstances: knowingly taking an intoxicant, even with awareness of its effects; taking a prescription drug with notice of its intoxicating effect; or simply using a common stimulant. These involve voluntary exposure to intoxication and generally do not qualify as involuntary intoxication. The specific legal impact can depend on the crime and jurisdiction.