I actually worry less about the one or two self-made homebrews I might have in an evening than I do when judging some of the entries in the beer competitions.
I do wonder at times whether the fusels in uncontrolled (i.e., too high) temp fermenation beers and specialty, smoked, and wood-aged beers might be dangerous to my health. Really--doesn't anyone else who is a BJCP judge ever wonder if, one day, you might be sampling or drinking a stranger's beer that, knowingly or unknowingly, is chock full of potential carcinogens, which may or may not even be detectable by aroma, appearance, taste, mouthfeel, etc.?