[freeeee]

Since they are minors and it is illegal to be on booze, drugs or cigs, I do see the interest in seeing they are clean.

That is mission creep: from educator to law enforcement officer. Even worse, it ignores 4th Amendment rights.

Besides, they are trying to regulate behavior that happens outside of school. That's not the school's place.

An 18 year old could legally smoke outside school, and get kicked off a team. Also, non-smokers could test positive from inhaling second hand smoke outside school.

[A CA Guy]

Minors have few rights and don't have the rights of adults in certain areas at all.
They are considered incapable of being self-responsible under the law.

They can enter into contracts legally and a bunch of other stuff like that.