1: QF is 100% effective on ALL drug tests. Keeping the temp right is the only easily taken care of issue.
2:Yes
3:At that distance you should be fine. If he gets to nosey pull your dick back in and call him a homo.
4:He has to get a search warrant to open a locked box or your car if you haven't given him permission. Or he get one of his phony drug sniffing dogs to hit on the car which gives him reasonable suspiscion to enter. Cops can get phone warrants if they want but usually don't. They'll just impound the car and get one at there leisure.
5: Depends on the state and how seriously they take mushroom possession

Just tough it out till you're an adult. We all had to do it to a certain extent. Once your 18 you can go do what ever you want and suffer the consequences yourself and your parents can say "I told you so you little bastard"lol