UFC 184 headliners Ronda Rousey and Cat Zingano have been subjected to out-of-competition drug testing prior to their Feb. 28 bantamweight title fight, according California State Athletic Commission executive director Andy Foster.

Zingano took her first test on Tuesday, while Rousey's test was scheduled for Wednesday, Foster said. Both fighters only took urine tests.

While the CSAC has yet to receive the results of either test, Foster said he expedited them so that he could receive the results before fight night.

Foster was in the process of randomly drug testing Chris Weidman and Vitor Belfort, however, that fight was recently scrapped from the card after Weidman injured his ribs in training. Foster said Rousey was especially excited when she was informed that both fighters will undergo out-of-competition testing, since she has long been a proponent for cleaning up the sport.

UFC 184, headlined by Rousey vs. Zingano for the UFC women's bantamweight title, will take place at the Staples Center in Los Angeles.