After conferring with two different doctors, the arbiter officially ruled "this was not a case of intentional doping."
"[F]or Roberts it must have been like lightning out of a clear blue sky for him to learn that by kissing his girlfriend this time that he was exposing himself to a prohibited substance," Thomas added.
USADA accepted the ruling on June 24, rescinding calls to ban the athlete, who went on to compete at the USATF Outdoor Championships that were currently underway. Roberts, was part of Team USA's winning 4×400-meter relay team at the 2016 Olympics in Rio de Janeiro, finished second in the 400, and will compete in August at the world championships in London.
While Roberts's story may sound unique, this is not the first time kissing has led an athlete to fail a doping test.
In 2009, French tennis pro Richard Gasquet was cleared for having cocaine in his system after evidence showed he ingested a trace amount of the substance after kissing a woman at a nightclub the night before.
Canadian pole vaulter Shawn Barber was also cleared after failing a doping test for cocaine when he proved he accidentally ingested trace amounts of the substance after kissing an escort he hired the night before.