Minor infractions are usually dealt with with small room restrictions. As you get more infractions the penalty will go up and can get steep. Example, being late to class or late to check in will be a room restriction or weekend room restriction…the weekday ones arent bad cause u are mostly in your room at night anyway. My brother who goes to Andover tells me it gets more lax over time…start the year strong and gradually weaken (though he got a letter to our parents about skipping too many classes, i think the limit is 6 per semester). For more serious stuff, like cheating or drugs, each school is different…some like Hotchkiss arent very tolerant and some are. Cheating can be the worse and you can get expelled almost immediately in most schools.