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DENVER — A former Littleton police officer will spend 48 months in prison for firearm and drug trafficking crimes.

Jeffery Johnston, 46, of Parker, Colo., was sentenced Monday.

He was arrested in July 2013 and pleaded guilty in October.

According to court documents, investigators were tipped that Johnston was using illegal drugs when a source said Johnston contacted him about buying Ecstasy.

The source cooperated with the FBI and arranged for Johnston to buy pills for about $1,300 at his home. After the exchange, Johnston was arrested, said Justice Department spokesman Jeff Dorschner.

Investigators searched his home and found guns, including a loaded Colt Officer’s Model 45-caiber pistol, an AR-15, two 12-guage shotguns and several other drugs including cocaine, steroids and hundreds of prescription pills, Dorschner said.

When Johnston was arrested, Littleton Police Commander Trent Cooper said the drug activity was on a personal level. Cooper also said there is no indication that other officers were involved and the drug activity had nothing to do with his function as a police officer.

“As a police officer who violated the public’s trust, a four year federal prison sentence is just and appropriate given the circumstances,” said U.S. Attorney John Walsh. “The fact that Johnston was involved in trafficking illegal drugs while also serving as a law enforcement officer is particularly disturbing.”