Justin Gatlin isn't a stranger to a scandal. After all, in 2006, the 35-year-old sprinter accepted an eight-year ban for a positive test — believed to be "testosterone or its precursors" as reported by Deadspin — which was later reduced to four years.

Now, Gatlin is embroiled in a different scandal, as he fired his coach, Dennis Mitchell, after an undercover investigation revealed that Mitchell offered to supply and administer HGH and testosterone.

The Telegraph sent a reporter, who went undercover as a movie producer, to Gatlin's Florida training camp, where the website claims Mitchell and Robert Wagner, an agent who worked for Gatlin, offered to supply and administer HGH and testosterone. They reportedly claimed that the use of banned substances is widespread in track and field and that "designer drugs can't be detected."

And it was all recorded by The Telegraph.

The explosive report paved the way for the United States Anti-Doping Agency and the Athletics Integrity Unit for the International Association of Athletics Federations to launch an investigation into Mitchell, Wagner and Gatlin.

"Investigations from tips and whistleblowers play a critical role in anti-doping efforts," a USADA spokesperson told The Telegraph. "We are presently coordinating with the Athletics Integrity Unit in order to investigate these claims fully."

Gatlin took to his Instagram account to proclaim his innocence in the matter, vowing that "I am not using and have not used PEDs."

It will be interesting to see USADA's findings after its investigation concludes.

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