SPU requires every incoming student to sign an agreement stating they will not drink alcohol, use tobacco products or illicit drugs, or engage in sexual activities. The only exception to this is if you are married—the sex part doesn't apply. However, the drinking and smoking does still apply even if you're legally of age. This policy is called "Lifestyle Expectations," and it is often a phrase uttered with sarcasm or dripping with disdain. There has always been a lot of talk about changing this policy, and it is rumored that it might be modified soon, so that students over the age of 21 will be permitted to drink.
If living on campus, rule-breaking is precarious, and, if caught, the most common penalty is a fine. Depending on the severity and situation, a student might also be required to complete educational courses on substance abuse or, in rare cases, be expelled. Appropriately, like many expectations in life, rules will be broken; don't break them on campus, and you'll be golden. The University isn't out to get anybody, and they seem to prefer blissful ignorance, so just don't flaunt it. Honestly, "Lifestyle Expectations" is kind of considered a joke, even professors will say with a gleam in their eyes something like, ". . .because I know none of you drink or have sex."