The Maryland State Athletic Commission randomly tested UFC light heavyweight champion Jon Jones on Wednesday and No. 1 contender Glover Teixeira was tested as well, ahead of their title fight at UFC 172 on April 26 in Baltimore.
The unannounced test consisted of both blood and urine panels, according to Jones, who is currently in training camp in Albuquerque, N.M. Jones (19-1) will seek his seventh consecutive title defense against Teixeira (22-2).
In an interview with Fox Sports, Jones said he and his management requested the random drug tests for several months. Neither he nor Teixeira have ever tested positive for a banned substance.
UFC co-owner Lorenzo Fertitta confirmed to ESPN.com the UFC has agreed to pay all costs associated with the random testing.
"The Maryland State Athletic Commission decided to conduct random drug testing for our event in Baltimore," Fertitta said. "We fully support their efforts and agreed to cover all the expenses related to the program."
Jones' head trainer Greg Jackson, who is a proponent of random drug testing in mixed martial arts, called Wednesday's tests "a step in the right direction."
"Everyone wants to make sure there is a level playing field," Jackson told ESPN.com. "I think Jon submitted the exact same tests Glover did and that way everything is out on the table.
"We said it would be a good idea. I'm all for it. I think it will keep the sport real clean. Whether it's for Jon's fight or someone else's, I'm all for it. If we're saying drugs are illegal then we need to say we're going to test at random times."
Athletic commissions are authorized to randomly test licensed combat athletes, although it remains rare due to limited state drug-testing budgets.
Former UFC welterweight champion Georges St-Pierre has publicly advocated for random testing since he vacated the title in December due to personal reasons.
Fertitta recently told ESPN.com the promotion is willing to handle the costs of random drug testing programs if athletic commissions request it.
"We're looking at all those different options," Fertitta said. "We're embracing whatever we can do to rid the sport of any performance-enhancing drug."