Riding in cars with boys

Client is a passenger in a car. Despite the fact that the car has license plates with current registration stickers on them, the cops decide to run the license plate. They seem to do this a lot when they see dark people driving old cars in bad neighborhoods who don't otherwise appear to be doing anything wrong.

Turns out the registration on this car is actually expired, so the cops pull over the car. Again, for reasons that they never explained, the cops drag the driver and passenger out of the car and ask to search the car. I can't figure out why: the occupants were not high, they were not driving erratically, there was nothing obviously wrong. Anyway, the driver of the car tells the cops that they're going to find some drugs hidden in there and gives details of the quantity, where he bought them, etc. My client, the passenger, didn't know there were drugs in the car, much less own the drugs that were found. Nonetheless, client gets charged with possessing with intent to sell.