It's no secret that American officials worry about doping in some sports more than others. Just look at the numbers.
The U.S. Anti-Doping Agency tested snowboard star Shaun White four times last year. Distance runner Galen Rupp was asked for seven times that many samples.
Rupp's total of 28 tests made him the most scrutinized American athlete in 2013, according to annual statistics released by the USADA this week. His sport -- track and field -- was monitored more heavily than any other.
USADA reports that it conducted 9,197 tests in and out of competition last...