All 22 fighters on the Feb. 2 UFC 156 event passed their fight-night drug tests. Nevada Athletic Commission executive director Keith Kizer released the information via email on Wednesday.

However, Kizer told MMAFighting.com on Wednesday that these results do not include additional blood work required of heavyweight Alistair Overeem. Overeem, who was knocked out by Antonio Silva in the evening's co-main event, was suspended for much of 2012 after flunking a random drug test in March.

Overeem's blood test results are expected within a week.

The event, held at Las Vegas' Mandalay Bay Events Center, was headlined by UFC featherweight champion Jose Aldo Jr's unanimous decision victory former lightweight champion Frankie Edgar.

Kizer also broke down UFC 156's attendance figures Wednesday. Attendance at Mandalay Bay was 10,275, of which 7,136 paid $2,437,150. There were 3,139 complimentary tickets on Super Bowl weekend and 548 unsold tickets.