If an underage person was at a high school party and there was alcohol but they were not drinking, could the police still take them? Even if they are not intoxicated?
It isn't just the drinking. They can test you and see you weren't, but there is an issue of minors being present where there is alcohol open and available with no adult supervision.
So they can take you as a minor being in an illegal situation and these days they make your parents criminally responsible in many states. You should know that just because you can get away with certain things with little trouble, It could be BIG trouble legally for your parents.