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 year. The individual totals do not reflect tests conducted by other organizations.
Successful athletes tend to rack up bigger numbers because top finishers often face additional testing. Rupp, for instance, has dominated U.S. distance running with a silver medal at the 2012 London Olympics and a string of national championships.
So it is not surprising to see the totals for swimmer Missy Franklin (22 times), sprinter Justin Gatlin (14), skier Bode Miller (10) and dual-sport star Lolo Jones (16) in bobsled and track.
Sprinter Tyson Gay, caught with a banned substance in his system last summer, was tested 12 times.
The 2013 statistics for other notable athletes included: speedskater Shani Davis (12), skier Lindsey Vonn (eight), tennis player Venus Williams (8) and figure skater Gracie Gold (two).
Track and field's 2,025 tests outdistanced the 1,500 conducted in cycling. Swimming, triathlon, weightlifting, skiing and snowboarding were also closely watched.
Among the least monitored sports? Cheerleading with 13, fishing with seven and surfing with six.
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