UFC president Dana White tweeted Overeem's clearance earlier Tuesday, and MMA Fighting confirmed the news with the Nevada state athletic commission (NSAC), which had ordered Overeem to take a new test after previous difficulties in obtaining a sample.
Under the terms of a conditional license, Overeem is still subject to a standard pre-fight test the day before UFC 141, as well as two random drug tests in the next six months at his own expense.
Last Monday, the Lesnar-Overeem fight was threatened when NSAC debated whether or not to issue Overeem a license. The commission's executive director Keith Kizer said that he tried to set up a random test on November 17, but Overeem didn't take a test until six days later and submitted himself to the wrong one.
While that blood sample reportedly came back clean, NSAC asked him to provide a urine sample known as a "basic steroid panel." He did so on December 7, but the results hadn't been made available by the commission's Dec. 12 meeting. In addition, Overeem admitted that he had taken the test at his personal doctor's office. As it turns out, that sample ended up being untested and destroyed, according to an email Overeem's doctor Jan-Jan de Bruijne sent the UFC. By then, however, NSAC had already ordered another test.
Overeem blamed the problem on a confusion with dealing with state athletic commissions on random tests for the first time.
His third and final test, taken in the UK two days after the NSAC hearing, came back "negative for all prohibited substances," according to Kizer.
As long as the final hurdles are cleared, Overeem-Lesnar will take place as the main event of UFC 141, Dec. 30 at the MGM Grand Garden Arena in Las Vegas.