Sucks that you guys get persecuted for such a small amount. The only time I got caught we were sitting in my friend's tinted car in an empty parking lot hotboxing the shit out of it and a cop blocked our exit. We had only a small nug left and thankfully my friend didn't turn on his ignition or he might have gotten a DUI.
The rest of us got off with a stern warning "have a friend drive you home, don't go back to your cars," which we disregarded anyway because driving high isn't like driving drunk. But the driver had to call his mom because the car was in her name, and also pay a small fine, but no drug tests.
From what I can tell, anything under an ounce here is just a fine. No drug tests or anything.