That's why pro-hormones are banned and tested for!!! There are fewer drug cheats in natural bodybuilding than you would think-in the UK anyway,don't know about the US.The drug testing in the NPA is done to IOC/WADA standards by UK Sports,who also do athletics,rugby etc,and is as strict as it gets.Also out of competition random testing is being introduces.The natural bodybuilding community is pretty close knit and anyone tested positive becomes a social leper as well as having to forfeit their trophies and prizes,pay for the drug test and receive a lifetime ban.There is the odd idiot who will try to cheat but I would say 95%+ are clean.