MANCHESTER, N.H. (CBS) – A Manchester art teacher has been arrested on criminal liability and child endangerment charges.

Police arrested Lisa Tagalakis Fedor, 42, and Kristopher White, 21, on warrants stemming from a drug investigation.

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Police say their roommate Robert Doane, 26, was selling drugs out of the apartment he shared with Fedor and White.

Fedor was aware that her roommate was selling drugs and had a firearm, police say.

According to police, Fedor allowed the activity to continue at their apartment even though Fedor’s two young sons were living there.

Police charged Fedor and White with criminal liability to drug sales and endangering the welfare of a child.

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Doane, whom police call a convicted felon, was seen trying to sell heroin to two men outside his apartment.  Police say they witnessed Doane become suspicious of the unmarked police car in the area and did not complete the sale.

When police searched Doane’s room they found cocaine and a handgun that had been reported stolen out of a car in a Target parking lot in Hooksett.

The gun was found in a room shared by White and Fedor. Police additionally charged White with receiving stolen property for holding the gun.

Doane was arrested on Feb. 7 and charged with receiving stolen property, convicted felon in possession of a gun, attempt to commit sale of a narcotic, possession of a narcotic and armed career criminal.

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Fedor’s children have been placed with a family member, police said.