Richard Rosenthal is busy, as usual. "It's been an interesting day," Denver's Independent Monitor quips to the TV crew setting up in his office conference room, high up on the twelfth floor of the Wellington E. Webb Municipal Office Building. Rosenthal has spent much of the day interviewing potential deputy monitors, trying to fill a vacancy and plug gaps in a staff that's long been overworked and underfunded. And while it's nearly 5 p.m., the day is far from over: The man in charge of policing the police plans to spend much of his evening poring over files at the Denver Police Department's Internal Affairs Bureau, looking into the evidence behind recent disciplinary decisions. And his BlackBerry might go off at any moment: Whenever there's an officer-involved shooting, an in-custody death or other critical incident, Rosenthal immediately rolls to the scene, day or night.