Cal. Health & Saf. Code § 109550
"Imitation controlled substance" means (a) a product specifically designed or manufactured to resemble the physical appearance of a controlled substance, that a reasonable person of ordinary knowledge would not be able to distinguish the imitation from the controlled substance by outward appearances, or (b) a product, not a controlled substance, that, by representations made and by dosage unit appearance, including color, shape, size, or markings, would lead a reasonable person to believe that, if ingested, the product would have a stimulant or depressant effect similar to or the same as that of one or more of the controlled substances included in Schedules I through V, inclusive, of the Uniform Controlled Substances Act, pursuant to Chapter 2 (commencing with Section 11053) of Division 10.
Ca. Health and Saf. Code § 109550