there's gotta be a way to use this while teaching

A friend of mine was trying to convince me that there are sounds only teenagers can hear. I suspected this "friend" was just trying to make me feel old (which, incidentally, should be an Olympic sport). However, it's true. So to what use is our Freedom and Liberty country folks putting this knowledge? Some mad scientist/fascist has developed a device that emits this teen-only sound for use to drive away teenage loiterers. Yes, fascism wins again.