The Athletics Integrity Unit (AIU) has sanctioned Mexican sprinter Yamile Herrera after she tested positive for a banned substance during the World Relays held earlier this year in Gaborone, Botswana.

On May 2, 2026, Herrera underwent a urine test following her participation in the mixed 4×100 relay, which revealed the presence of oxandrolone, a prohibited anabolic steroid. The AIU informed Herrera of the positive result, and on June 10, she admitted to violating anti-doping regulations.

At 26 years old, Herrera accepted the consequences and will serve a three-year suspension starting June 3, 2026. All her results from May 2 onward have been annulled.

The AIU also noted that Mexico’s National Anti-Doping Committee retains the right to appeal this decision before the Court of Arbitration for Sport in Lausanne, Switzerland.

This case highlights ongoing challenges in maintaining fair play in athletics, underscoring the importance of rigorous testing and transparent enforcement to protect clean athletes and the integrity of sport.