I am planning on passing out "Bio Bucks" at the beginning of the year to be used as a bathroom pass, locker pass or homework pass. The students will get ten and these and they are the only passes they have to leave the room. Once they are gone, if they want to leave the room they get detention. I am hoping this method will reduce the number of trips out of the classroom. If they don't use them, at the end of the year, they will count towards their final exam/lowest grade. I plan to stamp or sign the backs of them so they can't be duplicated (and when I take them up, I will save them to check for dups at the end of the year if I need to) Does anyone else have a similar system? What are some pros and cons? Is there anything I am overlooking?