RSA 644-A:3 Exceptions to Warrant Requirement.

A government entity may obtain the location information without a warrant:
I. To respond to a call for emergency services, including a request from an E-911 supervisor to an electronic communication service to determine the location of a cellular telephone when the supervisor informs the services that the information is required pursuant to an emergency involving actual or potential death, serious physical injury or major damage to property and the information is needed without delay. Such a request shall not create a cause of action against the E-911 system or employee or the electronic communication service or its employees;
II. With the informed consent of the owner or user of the electronic device concerned, except when the device is known or believed by the owner or