California, United States of America
The following excerpt is from People v. Diego, H036454 (Cal. App. 2011):
In order to establish that there was a usable amount of a controlled substance, "[t]he chemical analysis of the material possessed need only establish the existence of a controlled substance. A quantitative analysis establishing the purity of the controlled substance is not required." (People v. Rubacalba (1993) 6 Cal.4th 62, 65.) The prosecution need prove only that "the substance is in a form and quantity that can be used" and need not prove any particular narcotic effect of the substance. (Id. at p. 66.)
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