Lance Armstrong... greatest doper there was or ever will be

Plenty of sports are a much bigger joke than cycling, when it comes to doping. Football (all codes), tennis, golf, baseball etc. etc. must be delighted that all the doping stories are about cyclists getting caught, not about the rampant doping in their sports which they make no serious effort to control.

What evidence is there that there is rampant doping in football (association), tennis, and golf? That's a genuine question, I'm not trying to argue. In tennis, I've heard lots of speculation about Nadal and Djokovic, but do you know more than just speculation? I'm especially curious to know on what basis you think football has a doping problem.