It's official.

Former Ultimate Fighting Championship (UFC) lightweight and welterweight champion, B.J. Penn, along with his opponent, Rory MacDonald, have registered with the Voluntary Anti-Doping Association (VADA) and will be subjected to a battery of random blood and urine tests over the next eight weeks, according to a report from MMA Weekly.

Find out why right here.

Penn (16-8) abandoned his self-imposed retirement to see if he could still hang in the welterweight division. Ready to give him an answer is MacDonald, who meets the Hawaiian at the UFC 152 pay-per-view (PPV) event on September 22, 2012 from the Air Canada Centre in Toronto, Ontario, Canada.

And they'll be forced to come clean.

"The Prodigy" is just 1-3-1 over his last five fights and was ready to call it a career after getting knocked around by Nick Diaz at the UFC 137: "Penn vs. Diaz" event last October. Earlier in the year, he battled Jon Fitch to a majority draw in Australia.

His best days may be behind him, which is why the lines opened with "Ares" as the -300 favorite.

After a third round technical knockout loss to Carlos Condit back in June 2010, MacDonald (13-1) went on a three-fight tear, sending Nate Diaz back to the 155-pound division in the process. At just 23 years of age, the Canadian prospect has 12 finishes in 13 wins.

Get ready for war.

For more on the upcoming drug tests, which operate independently and outside the scope of the UFC, head over to the VADA website by clicking here. For more on the Rory MacDonald vs. B.J. Penn fight at UFC 152 click here.