I'm not 100% straight edge...
I have never smoked or done drugs and I plan on waiting till marriage to have sex.
I do drink, but very very rarely. I only drink when I'm away on vacations, and then normally it's only an occasional glass of wine, or a beer with my parents (or in a more recent case a shot of vodka, but thats something you have to do in russia, haha). I have only really drinken 3 or 4 drinks without my parents knowing, and 2 of those were in one night.
so yeah... my straight edgeness has a couple knicks. But i'm pretty good overall.