RSA 106-B:15 Jurisdiction of Police Employees.

I. Police employees have primary jurisdiction on all turnpikes, toll roads, limited access highways, and interstate highways and nothing in this section shall be construed to limit the authority of local police officers.
II. A police employee shall not act within the limits of a town having a population of more than 3,000 or of any city, except when he or she is enforcing the motor vehicle laws or the regulations relative to the transportation of hazardous materials, witnesses a crime, is in pursuit of a law violator or suspected violator, is in search of a person wanted for a crime committed outside its limits, is in search of a witness of such crime, is faced with public safety exigent circumstances, or when acting as an agent of the director of motor vehicles enforcing rule