Dr. Jon Hallberg on sports doping

Floyd Landis during Stage 17 of the Tour de France
Floyd Landis during Stage 17 of the 93rd Tour de France between Saint-Jean-de-Maurienne and Morzine-Avoriaz on July 20, 2006 in Morzine-Avoriaz, France.
Photo by Friedemann Vogel/Bongarts/Getty Images

Tour de France champion Floyd Landis is expected to learn the results of his "B" sample doping test Saturday. If the sample confirms the positive result of his first test, Landis could be stripped of his title and banned from the sport for two years.

Dr. Jon Hallberg is an employee assistance provider physician for the Minnesota Twins. He just returned from meetings at Major League Baseball headquarters in New York for discussions on professional baseball's policy on steroid abuse. He spoke today with MPR's Tom Crann about how illegal drug use is detected.

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