(Reuters) - Team Sky may have pushed rules "to the very limit" in the matter of Therapeutic Use Exemptions(TUEs), International Cycling Union(UCI) president Brian Cookson has said amid an investigation by Britain's anti-doping agency (UKAD) into British Cycling. Team Sky and former Tour de France winner Bradley Wiggins have been in the spotlight over his use of TUEs, which allow athletes to take banned substances for verified medical needs and are signed off by sports federations. UKAD has not shared much details but the local media claimed the probe also concerned the alleged delivery of a medical package to team Sky in June 2011 after the Dauphine Libere race and ahead of that year's Tour. More...