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Since the World Anti-Doping Agency first came under scrutiny this spring for its handling of positive tests for banned substances by nearly two dozen Chinese swimmers, the United States has been the agency’s chief critic.
Congress has threatened to cut funding for the agency, which is known as WADA. The Justice Department and F.B.I. have opened criminal investigations into how the tests were handled. And the head of the United States Anti-Doping Agency and American swimmers have raised doubts about whether WADA can be trusted to do its job.