Source, possibly credible:

Luke Cummo Suspended by Ohio Athletic Commission
by Thomas Gerbilski


UFC fighter Luke Cummo has been suspended three months for failing a random drug test administered by the Ohio Athletic Commission. The test, conducted after his loss against Luigi Fioravanti at Saturday’s UFC 82 event, showed that Cummo had extremely elevated caffeine levels beyond anything the commission had ever seen before.
“Normally we don’t pay that much attention to the level of caffeine in a fighter’s blood,” said OAC commissioner Warren Petty. “But Luke Cummo’s readings were off the chart. At first we thought there must be a mistake with the test, but follow ups showed that our original findings were accurate. This guy must have been tripping balls in the Octagon.”
Athletic Commission standards allow a fighter to have up to 800mg of caffeine in their system. Luke Cummo is said to have over 23,000mg in his system during the post fight test. In his defense, Luke Cummo released the following statement explaining the test results:

Before the fight I pumped three liters of coffee up my rectum as part of an enema to break up persistent gallstones. Never did I imagine that a procedure I perform on myself regularly would result in my suspension. While I am disappointed at the narrow mindedness of the OAC and it’s inability to recognize the benefits of drinking urine and performing coffee enemas, I accept their ruling.

Cummo’s agent Ken Pavia was angered to hear the news of his client’s suspension. “It’s terrible, just terrible. No one takes better care of themselves than Luke Cummo. He eats nothing but mud and sticks, for God’s sake. For the OAC to suspend him because he likes to put stuff up his ass is absurd. If they’re going to suspend every fighter who does that, there won’t be anyone left to compete.”
When asked for his comment on the latest suspension, UFC president Dana White said “He put what up his where? Are you fucking serious???”

from http://fightlinker.com/blog/

The Ohio Athletic Commission is suing an internet weblog for fabricating a story regarding the suspension of a fighter following Saturday’s UFC event in Columbus, Ohio. The story, circulated from a website called ‘Fightlinker.com’, claimed that UFC fighter Luke Cummo had been suspended 90 days for competing with three liters of coffee in his rectum.

“Our main concern is as always towards the fighters,” said a visibly upset Warren Petty, OAC commissioner. “They need to know very clearly what is acceptable within the rules of our commission. There is absolutely nothing on the books regarding what fighters may or may not have in their anus while fighting.”

Petty clarified that the only concern the OAC had was with banned substances turning up in blood or urine samples. “If a fighter were to place a steroid or something like that in his rectum, then that would be illegal. But only because that steroid would show up on standard OAC approved tests.”

“The OAC is not in the business of rooting around in a fighter’s ass.”