Comedy Central’s fictionalized Reno Sheriff’s Dept. is renowned for its laziness and lack of focus. With this feature-length version of their COPS parody, director Robert Ben Garant and his co-conspirators can now share that renown. Reno 911!: Miami is not unfunny: The characters are perfectly evolved screwups and the premise (every legit cop is quarantined at a police convention, leaving our heroes in charge of Miami) has potential. It lacks only the discipline of a 30-minute episode — or a YouTube video.