i raced for years and was national #2 for a few years in my division.. wwwwaaayyyy bbbaaaccckkk!!!.. lol.. but my nephew is taking my place and as far as i know they dont drug test for aba or nbl..
I still ride and now some top national guys and they were not tested but warned if they made olympics they would be tested. I just looked at the ABA rulebook and it doesn't state anything about drug testing.
I manage a bike shop and have a BMX track in my town. I have worked very closely with BMX athletes for years...I've never heard of any ABA/NBL drug testing practices.