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According to MMAJunkie.com:

"The UFC’s anti-doping policy, which is administered by USADA, states that if a retired athlete wants to return to competition, they “must tell the UFC, in writing, that they want to start competing again. After notifying the UFC, they need to be available for testing for at least six months before returning to competition.” Recent reports indicated Lesnar had begun that process.

Reports of a UFC return kicked into high gear Tuesday after a tweet suggested Lesnar, the current WWE Universal Champion, was back in the USADA testing pool and would be dropping his title belt at next month’s “SummerSlam” pay-per-view. The social media buzz to follow was that Lesnar aimed for a November UFC return at the promotion’s expected Madison Square Garden event in New York.

The outlet continued,

However, UFC Vice President of Athlete Health and Performance Jeff Novitzky, who oversees the program, told MMAjunkie there is “zero truth” to those reports.

“(Lesnar) is not currently enrolled in the USADA testing pool, nor has there been any inquiry on his part to do so,” Novitzky said.

MMAjunkie attempted to reach USADA for comment but was unsuccessful."