My public highschool required one to sign a voluntary waiver for random drug testing before they would issue you a parking permit. The logic being, you could always take the bus.
Even though I was totally straight laced, I took some offense to this. I tried various work arounds, but in the end just decided to forge a parking permit. And thus, highschool taught me that my principals were more important then arbitrary rules. A lesson that's served me well.