Cal. VEH § 312
This is the official text of Cal. VEH § 312, part of California’s Vehicle Code — governs traffic laws, driver's licenses, and vehicle registration.
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Official statutory text
The term “drug” means any substance or combination of substances, other than alcohol, which could so affect the nervous system, brain, or muscles of a person as to impair, to an appreciable degree, his ability to drive a vehicle in the manner that an ordinarily prudent and cautious man, in full possession of his faculties, using reasonable care, would drive a similar vehicle under like conditions.
Status: in_force · Read it on the official government site
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