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WASHINGTON, DC - FEBRUARY 28: American shot putter and Olympic gold medalist Adam Nelson testifies during a hearing before the Oversight and Investigations Subcommittee of House Energy and Commerce Committee February 28, 2017 on Capitol Hill in Washington, DC. The subcommittee held a hearing on 'Ways to Improve and Strengthen the International Anti-Doping System.' (Photo by Alex Wong/Getty Images)

WASHINGTON, DC - FEBRUARY 28:  American shot putter and Olympic gold medalist Adam Nelson testifies during a hearing before the Oversight and Investigations Subcommittee of House Energy and Commerce Committee February 28, 2017 on Capitol Hill in Washington, DC. The subcommittee held a hearing on 'Ways to Improve and Strengthen the International Anti-Doping System.'  (Photo by Alex Wong/Getty Images)