I think most professional athletes have tried or at least have come close to trying, or have known people who have tried, been pressured to try drugs in sports. It's a very brutal world, the world of doping. Some of them hold great images, reputations, and egos, and yet, the public has no idea they are using the drugs.
I believe some use drugs or at least health booster products in order to perform better, but that wouldn't be deemed illegal...they are just supplements for optimal health. Drugs would be considered harmful to the body. Some supplements may build strength, endurance, stamina, vision, flexibility, fat content, oxygen levels for improved cardiovascular performance.
Anyway realistically, no they don't use illegal drugs. However, they have trainers, access to the best equipment, training, best nutritionists, and doctors, and they train hard. Considering how far they have gone, using drugs would be very pointless and stupid defeating the whole purpose of their life, to pursue challenge, and the ethics of cheating. Personally, users should be fine heavily, banned for life, and it should stain their resume. i would not hire them to serve food. jail, no, but no earnings, like jose canseco.
Another way of answering your question....do you think some business owners or cops are bad? do you think there are owners or cops who are tied to the mob? do you think there are politicians or business people who are greedy or unethical? why then, do you think these people would not exist in the most competitive environment of sports, where people do almost anything to get to the top. their passion and drive have to seem almost sick with greed about winning, to the point of surpassing realism. I like to win, but i dont have so much of a drive that nothing else matters. I believe that these criminals exist just like any other criminals do, in the corporate world, in society, or in life. they are everywhere, and we can stop them, we will not respect them, and we will penalize them harshly. michael vick, brutal criminal, should not ever come back to the nfl. but regulations are only as good as the people behind it, who regulate it. should we check for drugs the same way we check with airport security? i dunno, is it that big a deal? anyway there's ways to beat the system, like smugglers do at airports, ways you cannot find or maybe are blind to the drug using in the sport. so yeah, a lot will probably find ways to cheat the system, but they are ruthless.