 On 15 August 2013, the United States Anti-Doping Agency (USADA) announced that Klier would be suspended for six months after admitting to doping during the period of 1999 to 2006.Later that day, the organization issued a statement confirming his acceptance to a six-month ban from 12 August 2013 to 18 February 2014.The action also included the stripping of all race results from 21 July 2005 onwards.