A Philadelphia police officer was arrested Tuesday on federal drug charges and accused of conspiring with a Baltimore detective to sell cocaine and heroin seized from the streets, reports the Baltimore Sun.

Eric Troy Snell, 33, of Philadelphia, is now the ninth police officer indicted in a widening scandal that has brought down the elite gun unit of the Baltimore police.

Snell attended the police academy in Baltimore and met Detective Jemell Rayam. Prosecutors wrote in an indictment that Snell plotted to have his brother in Philadelphia sell the drugs Rayam stole from criminals in Baltimore.

Snell was paid thousands of dollars by Rayam to arrange for the sale of the seized drugs, prosecutors wrote.

"Snell and Rayam discussed and planned with each other the sale of illegal narcotics, including cocaine and heroin that had been obtained or seized by members of the Gun Trace Task Force in Baltimore," prosecutors wrote.

Snell is the latest police officer—the only one from outside Baltimore—accused in the federal corruption case against members of the disbanded Gun Trace Task Force. The unit had been deployed to rid Baltimore's streets of illegal guns. While effective, the officers were also corrupt, prosecutors say.