A lot of punk rock bands though aren't straight edge, but still a lot of the fans are. Next time you're at a concert, look around for Xs on hands. It comes from the tradition at bars of putting Xs on underagere kids hands to show they wouldn't be drinking. Anyway, rock on!
Ahh, and should you ever see somebody with a pin or a shirt or something that says "sXe," that also means straight edge.