School is in session.

ZUFFA held its fourth annual Fighter Summit last week (July 9-10) in Las Vegas, Nevada, which included over 300 fighters competing under the Ultimate Fighting Championship (UFC) and Strikeforce umbrellas.

Lawrence Epstein, Executive Vice-President and General Counsel, was on hand to announce the organization's formalized written policy against performance enhancing drugs (PEDs) and other banned substances, considered a continuation of its existing policy, using similar guidelines to the National Football League (NFL).

That could explain why pro football Hall-of-Famer Michael Irvin was a keynote speaker.

Nevada State Athletic Commission (NSAC) Executive Director Keith Kizer was also in attendance to explain the ins-and-outs of Testosterone Replacement Therapy (TRT), which has become more prevalent among fighters in recent years.

Dan Henderson, Chael Sonnen and Frank Mir, among others, have all previously competed with a TRT exemption.

Not surprisingly, last week's Fighter Summit also touched on the responsible use of social media, including Facebook and Twitter, which likely stems from major public relations hiccups from both Miguel Torres and Forrest Griffin and their rape-related tweets.

Also taking place last week?

UFC 148: "Silva vs. Sonnen 2," which featured Anderson Silva stopping Chael Sonnen in the second round of their championship title fight at the MGM Grand. If you missed any of the action (shame on you) click here.