By Victoria JonesDecember 18, 2025 Sports U.S. Sprinter Erriyon Knighton Receives 4-Year Doping Ban, Faces Missing 2028 Los Angeles Olympics U.S. sprinter Erriyon Knighton has been handed a 4-year doping ban, sidelining him from competition and ruling him out of the 2028 Los Angeles Olympics, Yahoo Sports reports. The young athlete faces a major setback in his promising career.