All four co-headliners at the UFC on FOX 7 event in San Jose, Calif. passed their post-fight drug tests.
The April 20 card at the HP Pavilion featured lightweight champion Benson Henderson's split-decision victory over Gilbert Melendez. The co-feature bout was Daniel Cormier's UFC debut, in which he scored a one-sided unanimous decision victory over former UFC heavyweight champion Frank Mir.
All four fighters tested clean. The California State Athletic Commission released the public information on Tuesday.
Two unidentified fighters were tested at random and passed.
UFC on FOX 7 marked the second Zuffa event in California under new department chairman Andy Foster, with the first being UFC 157 in Anaheim on Feb. 23. One UFC 157 fighter, Lavar Johnson, flunked drug testing on that card.