Carman is the best agency hands down and I've been to them all more or less. As to your question regarding "clean" that would depend on the individual SP and what type of risky behaviour they participate in. What's nice about Carman is that her site indicates whether a girl is GFE or open minded. I might get some objections here but would suggest sticking with open minded girls as they don't generally kiss all the guys, if at all, and not to mention bbbj. However, what they do with regulars and outside of the Den is another issue, but I would guess their risk tolerance carries over to their personal life as well. Also, I am not aware of any agencies or micros that have a strict enforcement policy regarding tests, etc.