And yet most public schools (all?) in the US insist on chaperones for dances, anything overnight (where this isn't banned as it was in my district after 9/11...yep, no school-sponsored overnight trips (which includes any which involve travel, and air travel was separately banned) district-wide)), ski trips, whatever. "If you're not in sight of an adult, you're going to use that time to have sex and do drugs" seemed to be the mindset of the administration.