* cycling is a mix of moderate money and lots of drug testing. there are significant incentives to dope, but it's fairly hard to do these days since there is a lot of testing.
* big money sports (in the us especially - nfl, mlb, nba) are the jokes of the testing world. they rarely test and often inform their athletes when a test is coming. the big money basically assures that the incentive to dope is also big. but you'll never get caught if the testing process is a joke, so there is nothing to report.