Antonio Silva (Pictures) and Edwin Dewees (Pictures) have failed drug tests following their July fights in California, the California State Athletic Commission announced Thursday.

Silva, who won the EliteXC heavyweight championship on July 26 with his win over Justin Eilers (Pictures), tested positive for the anabolic steroid Boldenone. The commission suspended him for one year and fined him $2,500.

Dewees was positive for the anabolic steroid Nandrolone at a test level of 499 ng/mL. He was stopped in the first round by Antonio Rogerio Nogueira (Pictures) at Affliction’s debut show July 19 in Anaheim. The commission also fined Dewees $2,500 and suspended him one year.

In addition, the CSAC suspended William Jacobson (Pictures) indefinitely for failing to take his scheduled test for drugs of abuse after his Aug. 15 TKO loss to David Douglas (Pictures) on the ShoXC “Elite Challenger Series” in Friant, Calif. Jacobson, who was making his professional debut, lasted just 72 seconds.