Massachusetts State Police say a Maine woman who was pulled over in Bolton was trafficking heroin Thursday night.
Police pulled over Holly Grant, 40, of Palermo, around 10:40 p.m. after they observed her speeding on Route 495.
Three hundred bundles of heroin were found in Grant's car. Police also say Grant was unlicensed.
Grant was arrested and charged with speeding, unlicensed operation of a motor vehicle, distribution of heroin and trafficking heroin.
She is being held on $25,000 bail pending her arraignment.
It is not known if she has a lawyer.