Ohio Rev. Code Ann. § 2963.12

An arrest may be made by any peace officer or a private person without a warrant upon reasonable information that the accused stands charged in the courts of any state with a crime punishable by death or imprisonment for a term exceeding one 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 ground for the arrest, as provided in section 2963.11 of the Revised Code. Thereafter his answer shall be heard as if he had been arrested on a warrant.