Former super middleweight titleholder Lucan Bute's B sample came back on Friday just like his A sample did in late May: positive for the banned substance ostarine.
Bute initially tested positive for ostarine, also called enobosarm, in the wake of his majority draw challenging super middleweight world titleholder Badou Jack on April 30 at the DC Armory in Washington, D.C.
Ostarine, which is supposed to increase stamina and recovery ability, has been on the World Anti-Doping Agency banned list since 2008.
Yvon Michel, Bute's promoter, as well as the DC Boxing and Wrestling Commission, confirmed the positive B sample result.
Bute, however, claimed that he tested positive because of a tainted supplement he was taking during his training camp. He maintained that he has "never knowingly used illegal products" during his 13-year professional boxing career.
Bute said he retained Los Angeles-based lawyer Howard Jacobs to help him figure out how the banned substance got into his body. Jacobs collected all of the nutrition supplements Bute used in camp and had Korval Labs, an accredited laboratory in California specializing in sports, analyze each product.
According to Michel, the analysis of a product called Dynamite, a recovery aid, contained trace amounts of ostarine contamination.
Bute, 36, of Montreal, who held a 168-pound world title from 2007 to 2012 and made nine successful defenses, said the supplement was given to him by strength and conditioning coach Angel "Memo" Heredia, who has significant links to performance-enhancing drugs. He wriggled free of being prosecuted in the BALCO steroids scandal by testifying for the U.S. government, and several of his clients have been suspected of using PEDs.
Bute said he and his attorney "intend to pursue legal proceedings against the laboratory that has caused irreparable harm to (his) integrity and reputation."
Michel said details of their investigation would be sent to the DC Boxing and Wrestling Commission, which is expected to give Bute a hearing.
Bute is likely to face a fine and suspension, although according to DC Boxing and Wrestling chairman Adam Weers, there are no specific parameters in its regulations in terms of a maximum or minimum fine or suspension length. The result of the fight with Jack is also likely to be changed to a no decision.
The announcement of Bute's positive B sample came only one day after Bute (32-3-1, 25 KOs) became of one of four Michel-promoted, world-ranked fighters to enroll in the WBC's new Clean Boxing Program.
By enrolling in the program, Bute and fellow Montreal fighters Adonis Stevenson, the light heavyweight world champion, and Eleider "Storm" Alvarez and Artur Beterbiev, both light heavyweight contenders, can be randomly drug tested -- blood and/or urine -- at any time 365 days per year. They must be available at all times for any testing, which is being conducted by the well-respected Voluntary Anti-Doping Association on behalf of the WBC.