Tour de France: Frank Schleck withdraws from Tour after testing positive for banned substance Diuretics are not performance-enhancing in themselves, although they can be used to help riders lose weight, and therefore perform better in the tough mountain stages of the race. After the second rest day on Tuesday the race resumes on Wednesday when the 16th stage takes the peloton over four major climbs towards a downhill finish at Bagnères-De-Luchon. Schleck, whose younger brother Andy won the 2010 race after Spain's Alberto Contador was disqualified for doping, sits in 12th place, 9:45 off the pace of race leader Bradley Wiggins. Reporters besieged the gates of the Radioshack hotel, the Villa Navarre, in Central Pau. Two French Police cars were in attendance, reportedly to preserve law and order. Unlike performance-enhancing drugs, the use of diuretics is not illegal in France and not, therefore, an arrestable offence. A Radioshack spokesman at the team hotel said that Schleck reacted as if "he had been hit over the head with a hammer" when he was informed of the positive test. The spokesman added that the team intended to ride on and complete the Tour as Schleck has not tested positive for a performance enhancing drug. Schleck is also said to have voluntarily accompanied Police officers to Pau police station for an unspecified reason. A Police spokesman at the hotel confirmed that they have not searched the rooms of the Radioshack riders.