(Photo courtesy of MMAFrenzy.com.)

We previously mentioned that UFC lightweight Melvin Guillard had to pull out of his UFC 90 bout with Spencer Fisher for undisclosed reasons. Well, now those reasons are disclosed — and it ain’t lookin’ good. Sherdog is reporting that the Young Assassin is in custody at the Harris County jail in Houston, due to an August 13th arrest for violating probation on a 2007 drug charge. Guillard will be released to a drug treatment facility “as soon as space becomes available per the terms of his recently amended probation.” And it probably won’t be one of those cushy drug treatment facilities that lets patients take days off to go fight in Chicago, so there you have it.

Of course, this isn’t the first time Guillard has had drug/legal trouble since his UFC career began in 2005. The New Orleans native was suspended for eight months after testing positive for cocaine following a submission loss to Joe Stevenson at UFC Fight Night 9 in April 2007. (Guillard admitted using the drug six days before the fight, thinking it would be out of his system within 72 hours.) Four months later, he was arrested for possession of a controlled substance, but got off with a fine and two years probation — which he has now violated.

If you’ve been keeping score, that’s three strikes. Unfortunately, Guillard’s not nearly valuable enough to the UFC for them to keep giving him chances; we’d expect a semi-official announcement of his dismissal sometime this week. Guillard is still an exciting-enough fighter to continue to get work in smaller shows, but we’re more concerned about his health and well-being at this point. Let’s hope his latest incident compels him to clean up for good…