USADA is a non-profit, non government organization and the national anti-doping organization (NADO) in the US. The program is designed to protect clean competition and the integrity of sports. ‘
Additionally, the U.S. Anti-Doping Agency provides education, conducts testing, and oversees the results management process.
“The US Anti-Doping Agency is recognized by the UFC as the official, independent anti-doping agency for the UFC. United States Anti Doping Agency is also recognized by the United States Congress as the official anti-doping organization for all Olympic, Paralympic, Pan American and Para Pan American sport in the United States.”
Some UFC fighters who’ve been flagged include Jon Jones, Cris Cyborg and Brock Lesnar.
Coincidentally, Lesnar and Jones were booked for the stacked UFC 200 card in July of 2016.