Other than alcohol and marijuana, you don't hear much about drugs on the DU campus. Drinking is a fairly popular activity, to say the least, but there are plenty of other things to do if drinking is not your scene. Although many of DU's parties are judged by the amount of alcohol and/or marijuana present, it's not impossible to have a good time without them. At times, the campus buzzes with rumors of cocaine or methamphetamine, but for the most part, hard drugs aren't a factor. Most students don't want to even think about the consequences of getting caught with hard drugs, much less live out those consequences.
Even so, some students have their ways of finding their drugs of choice. Many times, however, this requires a bit of traveling to other (larger) schools. Some students take advantage of friends at CU or CSU, which are prime spots to buy what you're looking for.