what if your parents gave you something to drink???...thats completely legal.
Not really.
They should probably crack down on all of the drugs being taken before/during school before they worry about the alcohol problem. And I wholeheartedly agree with iago's first statement, that's 30% - 40% too low, as far as my observations have been.
I think it would matter which drugs. Alcohol is one of the worst. From what I see, if you were to judge the most popular drugs by most harmful to least harmful, I think it would go like this:
Meth->Crack->Heroin->Cocaine->Alcohol->Pain Killers (abused)->Real MDMA->Psychedelics->Marijuana
Alcohol is way up there because, well, it can cause a lot of problems. It would be most logical to crack down on alcohol, since meth, crack, heroin, and cocaine are not very abundant in high schools, at least not here. In high school, more people smoke weed and drink than anything else.
Going to school drunk is pointless anyway, at least to go there drunk and learn. Most people do it because it's fun, and for social reasons. I've never been intoxicated in any way at school, but I do know that the most prevalent drug being sold/used in school is Marijuana. The only reason that may be bad is because Cannabis should be a drug for adults (18+), not 15 year olds who are trying to be cool.
And although I drank in my high school days (and I still do a bit, but rarely), I think it's stupid to do it while so young. But I would not bash Newby for doing it, because then I'd be a hypocrite.
All in all, though, I think drug tests are an extreme privacy invasion.