EVERGREEN PARK, Ill. (AP) -- Students at a suburban Chicago high school will have to hold it or risk staying after school.

A policy at Evergreen Park High School allows students to leave class three times per semester to go to the restroom. After that, they have to make up any missed class time after school.

Principal Bill Sanderson tells the (Tinley Park) SouthtownStar ( http://bit.ly/qWWm4L ) that the policy is designed to make sure that students don't miss valuable class time. He says it deters them from using restroom visits as an excuse to miss class.

Each teacher gets to decide whether to enforce the policy in their classes.

But some students argue that they don't have time to stop at the restroom otherwise because they only get five minutes between classes.