- Samuel Chi: U.S. has been one of biggest offenders in terms of performance-enhancing drugs in sports
- If U.S. is truly committed to drug-free competition, it should sign on to IOC's proposed zero-tolerance policy, he says
(CNN)American athletes are making noise about competing clean at the Rio Olympics. But maybe they should turn down the volume some. Because the truth is that the United States has its own less-than-proud history when it comes to doping.