Updated

A high-profile Arizona law-enforcement officer who has been outspoken about his support for the state's controversial new immigration law is receiving death threats, myFOXphoenix.com reported late Monday.

Some of the threats against Pinal County Sheriff Paul Babeu were from the Mexican mafia and drug cartel members.

Outside law enforcement teams brought in to investigate the threats found them credible.

Babeu was very outspoken about the need to secure the state's border with Mexico -- a known entry point to the U.S. for drug smugglers and illegal immigrant traffickers -- and supports law SB1070, which makes illegal immigration a state crime.

Despite the threats, Babeu declined a personal security detail because the county resources were already stretched.

"I understand this threat, yet I will not run in fear or change my support for SB1070 and my demands for President Obama to secure our border with 3,000 armed soldiers in Arizona and start building the fence again," he said.

"I'm always armed, and as every law enforcement member knows, we always have to be aware of our surroundings and possible threats."

Pinal County is nearly 5,400 square miles and much of the desert is known as a drug and human trafficking corridor.