Lets face the facts
Some people (like me *blush*) play with their Tamagotchi(s) at school only when there tamagotchi NEEDS the attention and the sound is off
Other people play with their tamagotchi(s) even when it doesn't need it and plays with it non stoped with the sound off (doing this will get you more likely embaressed with the risks)
And other people pause their tamagotchi and don't even bring it to school
also people may leave the sound on pause their tamagotchi and bring it to school
No matter what people choose to do no one can stop them no matter how much people say "It's bad!!"
So face it! No one here can tell anyony what to do with their tama at school.