Dunno.
Not to steer your thread off topic, but I can't understand how steroids would help you in golf all that much. Yeah distance can help some, but placement, course management, and - most importantly - touch on and around the greens are all much bigger factors in a golfer's success. Look at Tiger himelf at the Open. He blasted his tee shots all over the damn place. But he put on one of the greatest putting performances of all time. That's what won him the Open more than anything else.
I can't see anybody taking 'roids. Besides, apart from Tiger, have you seen these guys? Mickelson has frumpy bitch tits, guys like Sergio and Charles Howell are in decent shape but they're skinny as hell, Miguel Angel Jimenez has a beer gut, and then there's John Friggin Daly.
I think this is one sport where drugs are clearly not prevalent. And I'm not even sure you need to test, because I'm not sure they give you a significant advantage.