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Anti-Doping Agencies

World Anti-Doping Agency China Anti-Doping Agency USA Anti-Doping Agency Nationale Anti-Doping-Agentur Usada WADA National Anti-Doping Agency (NADA) Contamination Cases NADA USADA

Shelby Houlihan Enters World Championships 5,000m After Four-Year 'Burrito Ban'

Her return highlights ongoing divides in how anti-doping authorities handle contamination claims.

Senators Intensify Scrutiny of WADA Over Chinese Swimmer Doping Case