World-class potty training?

Our middle school - arguably one of the state's finest - issues laminated punch cards to students at the beginning of each trimester. Each time a student needs to leave the classroom to go to the bathroom, visit her locker, etc., it costs one of the 12 punches.

Sorry, student, that it's week 7 and you're out of punches. No going to the bathroom for you.

Inhumane? Degrading? Illegal? What are your thoughts regarding this practice? Anyone else's school doing this?

Oh, and did I mention that unused punches can be used for extra academic credit in some teachers' classes?

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