A female cyclocross racer was found to have a motor in her pit bike at the world championships several years ago. I'd say MLB and the NFL have drug problems as well and since their testing has been negotiated by the unions, it's more predictable and easier to avoid getting caught. Remember when Peyton Manning was caught receiving a shipment of HGH from Mexico that he claimed was for his wife? He then miraculously came back from a debilitating neck injury. Cycling drug testing is year round and unannounced. They need to know where you are 24/7/365 and can show up anywhere.