Idaho Code § 19-4514

The arrest of a person may be lawfully made 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 (1) year. 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 grounds for the arrest as provided in section 19-4513, Idaho Code, and thereafter his answer shall be heard as if he had been arrested on a warrant.