THOMASTON — Officials say $30,000 worth of heroin headed for the Maine State Prison in Thomaston was seized at a store where goods made at the prison are sold to the public.

The heroin was found Monday in the bathroom of the Maine State Prison Showroom.

Knox County sheriff’s deputies say a woman dropped off the drugs at the store in downtown Thomaston, which sells goods such as wooden toys and furniture made by inmates, who staff the store.

Chief Deputy Tim Carroll says one of the store’s inmate employees planned to take the heroin back to the prison in Warren.

The Bangor Daily News says charges are pending against the woman who left the heroin in the store.

Prison officials say inmates are searched for contraband when they return to the prison.