get a damned good attorney. chances are the police charged you both because they didn't know exactly WHO to charge--they figure it'll be settled in court, by the probation dept, or the D.A.

if he has confessed to the weed, and you said it wasn't yours... i'd say you have a very good chance of getting off the hook. not to give you false hope. but i'm sure the new jersey courts have bigger fish to fry.