The best thing to do is just not leave lots of stuff in your car. If you are carrying extra on you put it in your trunk. Even if they search your car they cannot search your trunk without a warrant since it is locked. That also goes for other parts in the car as well I believe, so if you have an area in the car you can put it in and lock it in there, they cant do shit about it without a warrant. The best thing is just roll a joint and smoke it cause if you get pulled over you can get rid of that pretty easy and then they cant do shit. The biggest thing is be smart about things, I had to learn the hard way twice, but after talking to my lawyer and using more common sense I have had no probs since.