What is the test for a driver to be convicted of possession of heroin?

Here, the substance was found in defendant's car, and he was the driver. While the heroin was not in plain view, it was found in a baggy in an ordinary compartment of the car, and Officer Fok apparently had no trouble finding it. In the same compartment was a second baggy containing marijuana. Defendant, at the time of the traffic stop, had a marijuana cigar in his lap. This constitutes reasonable, credible, and solid evidence from which a rational finder of fact could find, beyond a reasonable doubt, that defendant knew he was transporting heroin in his car. A driver's knowledge of the character and presence of the drug, together with his control over the vehicle, is sufficient to establish his guilt for transporting the drug. (Rogers, supra, 5 Cal.3d at pp. 135-136) The crime can be established by circumstantial evidence and any reasonable inferences drawn from that evidence. (People v. Meza (1995) 38 Cal.App.4th 1741, 1746.)