The Tucson (Ariz.) PD started its home invasion unit two years ago to curb paramilitary raids on drug houses by well-organized crews with military grade weapons. The crews were well trained and often posed as police officers. In an interview from Tucson PD headquarters on Tuesday, the unit's Sgt. Bob Jimenez discussed the unit's approach to enforcement and outlined two recent cases, including a shootout with two former Marines with an SKS rifle. View the "Tucson Home Invasions: The Missing Man" photo gallery of one of the cases.