RSA 105:13 Extended Authority.

I. The authority of any duly authorized police officer, constable or watchman of any town or city shall extend to any other city or town in the state, provided that the chief law enforcement officer of the requesting town or city has executed with the chief law enforcement officer of the responding town or city a written agreement which sets forth the terms and conditions under which such assistance may be requested or rendered. The executed agreement shall constitute authorization for every request for assistance, and for any assistance rendered in accordance with the terms and conditions of the written agreement, regardless of whether the responding police officer, constable, or watchman is named in the agreement. In an emergency situation, the ranking on-duty law enforcement offi