Nevada Athletic Commission
On May 8, 2006, he challenged Jorge Arce for the interim WBC flyweight title, but was defeated by 6th round tko. After the fight, Álvarez was suspended by the Nevada Athletic Commission for the rest of 2006 and fined $2,000 because he failed a post-fight urinalysis. Álvarez tested positive for the banned diuretic Furosemide, also known as Lasix.