You're screwed. Sadly witnesses are enough to make a charge on. Your only hope is by proving it's not marijuana. If you can't do that ((as in, it's been disposed of, whatever)) then just take the suspension and ignore that shit. Might consider fucking the kids vehicle up something fierce though. That they can't prove shit about. Fucking up vehicles has almost become a past time for me. Rat on me? There goes your windshield, you've got instant-hardening-foam in your exhaust pipe, and 5 pounds of sugar in your gas tank. Leave no evidence, be sober. Lie your ass off.