Is there any evidence supporting a conviction for possession of drugs for sale?

Defendant also points out that there was no testimony about the strength of the tablets. Generally, "The 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 fact the record does not show whether or not defendant had a good product does not tend to show simple possession, rather than possession for sale.

Accordingly, we conclude substantial evidence supports the conviction for possession of narcotics for purposes of sale.