Having ASU contribute to the enforcement of drug laws by kicking out students caught using drugs is a fine idea and fits right in with the current trend of children turning in their parents for drug use.
But why stop there?
There are other laws which ASU could help enforce as well. Cohabitation is still a felony in Arizona, so let's kick students out for that, too. The U.S. Supreme Court sodomy decision means Arizona's laws on that subject are still constitutional--which means students should be kicked out for engaging in oral or anal sex, whether it be heterosexual or homosexual. Then there is purchasing alcohol for minors, renting obscene videotapes, speeding, parking illegally, jaywalking...