Problem only is, you never know if someone is really 100% lifetime natural (no pro hormones, AAS, GH, etc.). My guess is that 90% of "natties" lie.
Maybe I'm naive, but I don't think it's that high. I would feel like a total idiot lying about that. I know some do though. Nonetheless, that's why I made a point of using the shoe size example-some people just damn big and statistically speaking, a certain small amount of them are going to do bodybuilding. At my last job for instance, there was a guy that was 6'2", 240lbs or so, easy 18" arms, with like size 18 shoes and arms so long he could friggin scratch his knees without bending down, pastor at a church, was very negative towards drug use. He could have been using, I know, but I don't think he was. I think he was just a damn big dude.