Contestant who failed a polygraph test at a natural bodybuilding competition gave an unusual excuse-- before he was even tested!
Respected bodybuilder organizations that require 'natural only' (no steroids, HGH, diuretics etc in the past 7 years) use polygraph to confirm compliance.
A Hispanic male contestant told his polygrapher during the pre-test interview that "I read an article that said most Hispanics and Blacks fail polygraphs". Examiner explained to him that the instrument does not know the race of the person being tested.
Contestant failed over and over on steroid use while passing questions on all other banned substances.
He was offered the 'second chance' option: a quick blood test. He refused.