Driving down the road in a smoke filled car with a few roaches sitting in the ashtray. Come up to an accident and police stop me while they're cleaning up the mess.
Good cop - "OK, you can go. Be careful"
Bad cop - "Get out of the car with your hands where I can see them". followed by my head being slammed against something hard (road,hood,etc) and the faint sound of handcuffs as I lose conciousness.
Really bad cop - does the above and keeps my stash, booking just the roaches as evidence...........Judge: "It says in the complaint that you were driving eratically and caused an accident, then fell over a bank while trying to elude the officer, knocking yourself unconcious. On further investigation, the officer found multiple roaches in your ashtray." "Your Honor, it's all a lie, what about the ounce of weed that was under my seat?"