Would be cool if they had a roid olympics, but it would never work since there is no country where it's 100 % legal.. and all the negative aspects like it would give bad influence to youths etc
Anyway, I belive that a very high rate of the athletes are using some kind of steroids - more then most people would think. 8 years ago, the rate was probobly much higher in some sports like 100 meters.. People keep finding new ways to pass the tests, and new kind of drugs that cannot be detected etc.
Side effects of many drugs and steroids can be heavily limited if used safe, but most people don't use them safe unfortunaly
GH is a very safe drug for instance, but most BB's use too much of it and might get ugly side effects. Anavar is also a very safe drug, and so is many kinds of testo in low dosages..