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.

(Added by Stats. 1971, Ch. 1530.)

Terms Used In California Vehicle Code 312

  • Person: includes a natural person, firm, copartnership, association, limited liability company, or corporation. See California Vehicle Code 470
  • vehicle: is a device by which any person or property may be propelled, moved, or drawn upon a highway, excepting a device moved exclusively by human power or used exclusively upon stationary rails or tracks. See California Vehicle Code 670
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