It was rumored that asthma medication may have caused Brock Lesnar’s positive tests at UFC 200, but the former UFC heavyweight champion has instead requested tests on both an eye medication and foot cream for clomiphene and clomiphene metabolites, MMAjunkie has learned.

In a request to postpone a disciplinary hearing on two failed drug tests in connection with UFC 200, Lesnar’s attorney advised the Nevada State Athletic Commission of efforts to determine the source of the banned substance.

At the time of the motion, those efforts had been unsuccessful.

“We are still investigating this matter (which investigation includes the ongoing testing of products used by Mr. Lesnar prior to the date of the positive test),” wrote Howard Jacobs, a prominent anti-doping attorney representing Lesnar, in a letter dated Sept. 19. “To provide further detail, I am advised that the testing laboratory (Korva Labs) initially tested an eye medication, which was negative for either clomiphene or clomiphene metabolites. Subsequent testing has been conducted on a foot cream; that testing has included three separate extraction attempts, all of which have failed. A fourth extraction attempt is being made by Korva Labs this week.”

Korva Labs, also known as Scott Analytics, is headed by Paul Scott, a former director of clients at the World Anti-Doping Agency-accredited UCLA Olympic Analytical Laboratory. Scott testified on Anderson Silva’s behalf during the ex-champ’s bizarre hearing on multiple anti-doping violations from UFC 183. He also worked alongside Jacobs during cyclist Floyd Landis’ arbitration with the U.S. Anti-Doping Agency.

“As you may be aware, testing of such creams can be a difficult process, as the extraction process can be significantly complicated by both a complex matrix and interfering substances,” Jacobs wrote. “Until a successful extraction can be accomplished, this product cannot be tested for contamination with clomiphene or clomiphene metabolites. For this reason, the extraction failures to date provide no indication as to whether or not this cream is contaminated with clomiphene or clomiphene metabolites.”

MMAjunkie obtained the letter through a public records request with the NSAC. Jacobs wasn’t immediately available for comment on the exact medications that were tested on behalf of Lesnar, or the result of the fourth test and any subsequent tests. Multiple requests to the fighter via his reps have been declined.

Lesnar failed an out-of-competition urine test performed by UFC anti-doping partner USADA 11 days prior to his pay-per-view fight with Mark Hunt at UFC 200. He also failed a fight-night test. Both came back positive for clomiphene and its metabolites, which are a WADA-banned estrogen blockers that are known to compliment steroid use.

Clomiphene, which helps the body kickstart natural testosterone production, is traditionally taken orally in pill form, so it’s unclear how it would be present in an eye medication or foot cream.

Lesnar (6-3 MMA, 5-3 UFC) promised to “get to the bottom” of the situation and hired Jacobs, who also is representing interim light heavyweight champ Jon Jones (22-1 MMA, 16-1 UFC) after he tested positive for clomiphene and letrozole – both estrogen blockers – and was scratched from a title unifier with Daniel Cormier (17-1 MMA, 5-1 UFC).

The results of Lesnar’s out-of-competition test weren’t discovered prior to the July 9 pay-per-view event; he fought Hunt (12-11-1 MMA, 7-5-1 UFC) and won a unanimous decision. Now, the ex-heavyweight champ faces penalties from USADA, which could suspend him two years as a first-time offender, as well as the NSAC.

Because Lesnar’s alleged offense took place prior to the commission’s implementation of new anti-doping rules, he is likely to face less stringent punishment. Typically, first-time steroid offenders have received a one-year suspension.

“I assure you that we have been diligent in our investigation and testing, and that the requested delay is not being sought for any improper purpose,” wrote Jacobs. “If the hearing can be rescheduled to a mutually agreeable date in November, I am confident that we can be prepared so that the case can be heard on the merits at that time.”

The NSAC on Monday granted Lesnar a continuance after receiving assurance from the California-based Jacobs that he will hire local counsel to formally represent the fighter during the hearing.

For complete coverage of UFC 200, check out the UFC Events section of MMAjunkie.