Why do some local police have authority on interstate highways? I recently moved to Cincinnati, and I'm very displeased to learn that the Cincinnati, Loveland, and Sharonville police hang out with radar on Interstates 75 and 71 to enforce speed limits. In all my travels throughout the country, I've never seen or heard of anyone other than state police with such jurisdiction. Are speeding tickets issued by local police on interstate highways contestable with regard to jurisdiction? Please advise. Thanks.