ESPN is reportingthat Frank Schleck of Luxemborg failed a drug test on Tuesday and will withdraw from the Tour de France.
The 32-year-old RadioShack Nissan Trek leader finished third in the 2011 Tour de France and was 12th overall this year, 9 minutes and 45 seconds behind Bradley Wiggins.
Schleck tested positive for the diuretic Xipamide on a sample taken on July 14th. The Radioshack team decided to withdraw Schleck from the race as the diuretic wasn't in any medicine used by the squad.
Team spokesman Philippe Maertens said Schleck had gone to the Pau police station of his own accord to cooperate with authorities. Maertens said the rider knew police would likely be coming for him.
Radioshack will still compete in the race but will struggle to remain competitive without their top rider.