I use these passes in my middle school science class. I keep a stack of them in my desk and I've also tried giving a limited number out at the start of each quarter. They fill it out, bring it up to me, and I sign it. Either way I avoid needing the community pass that travels back and forth to the bathroom each day. So many germs! When they return, they drop it in the "Used Passes" bin or the recycle bin.