Six UFC 102 competitors tested for “drugs of abuse” and performance-enhancing drugs have come back with negative results, according to a release distributed by the Oregon State Athletic Commission on Friday.

Headliners Randy Couture and Antonio Rodrigo Nogueira, along with Todd Duffee, Evan Dunham, Aaron Simpson, and Chris Leben were all tested in conjunction with their participation at UFC 102 on Aug. 29 at the Rose Garden Arena in Portland, Ore.

Leben was tested pre- and post-event as well, according to the report. The Oregon native was flagged for the steroid Stanozolol and served a nine-month suspension doled out by the promotion following his UFC 89 loss to Michael Bisping in Birmingham, England, in October 2008.