All drug tests conducted at the recent World Series of Fighting and Resurrection Fighting Alliance events in Las Vegas came back negative.

Keith Kizer, executive director of the Nevada Athletic Commission, informed Sherdog.com of the results on Friday, revealing that all fighters on both bills were tested.

WSOF 1 took place Saturday at the Planet Hollywood Resort and Casino. The promotion’s debut event aired live on the NBC Sports Network and saw former UFC champion Andrei Arlovski knock out ex-IFL talent Devin Cole in the evening’s headliner. The Nov. 3 event also showcased a light heavyweight showdown between onetime UFC welterweight Anthony Johnson and Bellator tournament veteran D.J. Linderman, resulting in “Rumble” starching Linderman in the first round.

The evening prior, RFA 4 offered up an 11-fight bill from Texas Station, topped by a lightweight showdown between UFC veterans Tyson Griffin and Efrain Escudero. Griffin emerged victorious in the main event, taking a unanimous decision in his first appearance since receiving his UFC release one year ago. Also of note, welterweight prospect Chidi Njokuani earned the seventh knockout of his career, as the 23-year-old stopped Phil Dace with punches in the third round.

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