In every sport, at every level, there are occasional opportunities for athletes to bend or ignore the rules to give themselves an edge.   And in every sport, at every level, at least some of them do.   Cheating, in all its myriad forms, has long been an unavoidable part of sports. For hundreds of years, it has been at the center of some of the most dramatic athletic scandals and controversial moments, raising questions of integrity and, in many cases, spurring significant changes to the rules themselves.   The history is so long and vast that it would be impossible to come up with a comprehensive list of cheating incidents in sports. So instead, here is a timeline of some of the more high-profile cases. For more on this 10-part series from USA TODAY Sports, tap on the 🔗 in our bio.