U.S. marshals are looking for a man with a extensive criminal history who has fled a drug treatment facility.

Calvin Coolidge Cannon, 39, had been ordered to stay at a Montgomery County drug facility as part of his 2007 conviction for drug-dealing while armed.

On Feb. 17, Cannon walked out of the rehabilitation facility and hasn't been seen since. "We're looking for him," said Supervisory Inspector Matt Burke, of the Capital Area Regional Fugitive Task Force, or CARFTF. "Our concern is that Cannon will fall back into drug use and back into criminal behavior to support his drug use."

Cannon has prior arrests for drugs, weapons, burglary, handguns, probation violation, assault and assault on police, authorities said.

Cannon is listed as being 6-foot-1 and 230 pounds. He has a large, distinctive tattoo around his collar-area and upper chest. He also has tattoos on both arms.

Law enforcement officials believe Cannon has cut his dreadlocks but kept his beard.

Cannon has ties to Gaithersburg, Rockville and Takoma Park.

"The task force wants The Examiner's readers' help in locating Cannon before he slips back into his unlawful behavior and becomes a threat to the community," Burke said. "Preferably, Calvin will see this and turn himself in."

Anyone with information should call the U.S. Marshals Fugitive Task Force at 301-489-1717.

Tips from readers of The Washington Examiner have led directly to the arrests of 45 fugitives, including at least eight who had been wanted for or convicted of murder.

Last month, an alert reader spotted a convicted kidnapper -- who had been on the run for two years -- staying at a resort in the mountains of Western Maryland.

CARFTF, run by the U.S. Marshals Service, is composed of 30 federal, state and local agencies from Baltimore to Norfolk.

The unit has captured more than 33,000 fugitives since its creation in 2004.