RSA 455-A:3: Powers.

Every justice of the peace shall have the power to administer oaths, perform marriage ceremonies, acknowledge instruments, and any other power prescribed by law. A justice of the peace signing an acknowledgment or jurat on any document or instrument shall type, print, or stamp the name of the justice of the peace and state the expiration date of his or her commission on the document or instrument. However, failure to meet these requirements shall not impair the legal validity of any acknowledgment or jurat.