[aruanan]

Breath mints won't cut it anymore for students who have been smoking in the bathroom -- some schools around the country are administering urine tests to teenagers to find out whether they have been using tobacco.

I wonder how they can weed out environmental smoke from parents and friends.

[Wolfie]

I wonder how they can weed out environmental smoke from parents and friends.

They said the same thing about pot smoke. The standard reply is that it is the student's responsibility to avoid exposure to such undesirable activity.