They don't enforce for the same reason the NFL doesn't enforce it...it would destroy the NFL just as it would the IFBB. Leagues like the NFL have as much drug use as the IFBB, more if you take into account there are far more individuals.
Granted, the NFL, just like the MLB does have to give up the sacrificial lamb now and then due to such a huge spotlight, but that does not change facts.
The other big difference, and this is why it stands out so much in the IFBB rather then the NFL. When you have guys who are conditioned down to the bone, things simply look freakier and stand out more. Every foot ball player is using the same drugs, they're just not "in shape" as far as BB standards go.
Anyone who doesn't believe this, please use your brain for 2 seconds and come to reality. You don't have 350lb linemen running 4.6 40's who are natural, you don't have RB's who are 240lbs at 5'7" running even faster without drug use...lots of drug use.
Howie, one quick comment on what you said about it taking away from hard work...how so? This is one of the things that eeks me about the "natural militia" more then anything. Work is work, drugs or no drugs. I've said this on here many times, performance enhancing drugs are not there to make things a cake walk, they're there to help you do what you already do, just a little bit better.