Multi-agency investigation leads to arrest, significant drug seizure in Rockingham County

DOVER — In a coordinated effort by local and federal law enforcement agencies, Heather McGrath was arrested on Jan. 23 on charges related to the sale of controlled substances, leading to the discovery of large quantities of narcotics, including suspected fentanyl.

McGrath’s arrest in Kittery, Maine, by local police on a warrant for two counts of sale of a controlled drug was the culmination of an extensive investigation involving the Portsmouth Police Department, Somersworth Police Department, and federal agencies.

The collaborative probe also included the Strafford County Sheriff’s Office, Rockingham County Sheriff’s Office, and Dover NH Police Department.

Following McGrath’s arrest, multiple search warrants were executed on her properties.

A storage unit search led by the Strafford County Sheriff’s Office, Rockingham County Sheriff’s Office, and Dover NH Police Department yielded about 650 grams of suspected fentanyl.

A subsequent search by the Kittery Police Department, Portsmouth Police Department, and assisting federal agents uncovered additional suspected narcotics on McGrath’s property.

Investigators found approximately 700 grams of suspected fentanyl, 150 grams of suspected powdered cocaine, 15 grams of suspected crack cocaine, and 80 grams of suspected methamphetamine.

Currently held at the York County Jail, McGrath is awaiting extradition to New Hampshire to face the charges, classified as a class B felony.

The investigation is still active.