Despite how much I dislike the current policies that are in effect, I don't see how this is any different than putting metal detectors in DC area schools to screen for guns.
It's the same difference, but instead they are catching kids that are getting doped up on the weekends too. For some kids, this just might help them get through HS and finish fairly well... other kids, well, they'll just leave HS when they turn 16.
Then of course, it just means that during the summer, they'll still be doing drugs. No one to test them, and they can get "clean" roughly 2 weeks before they go back to school.
It'll also probably mean that when they get to college they will be ill-prepared for drugs, or whatever, and it could leave the door open to them trying them and leading to the road of addiction. (In the case of most drugs, not all are addictive)
So, is this a good idea? IMO, it's an "okay" short term plan... but they needs to be gettin' some new ideas.
-SW