RSA 612:14: Arrest Without a Warrant.

The arrest of a person may be lawfully made also by any peace officer or a private person without a warrant upon reasonable information that the accused stands charged in the courts of a state with a crime punishable by death or imprisonment for a term exceeding one year, but when so arrested the accused must be taken before a judge or magistrate with all practicable speed, and complaint must be made against him, under oath, setting forth the ground for the arrest as in RSA 612:13, and, thereafter, his answer shall be heard as if he had been arrested on a warrant.