The Las Vegas Metropolitan Police Department Crime Lab is a modern crime lab and shares a lot (but not a building) with the Las Vegas Police Department. It reports to the sheriff's office. In early episodes of season one the lab is frequently referred to as the number two crime lab in the United States, solving cases believed unsolvable. The lab consists of specialist laboratories, a larger office (used by the Supervisor in seasons 1-9, and subsequently as a bullpen in seasons 9-11 and the Director’s office from season 12 onwards), a smaller office used by Catherine Willows between seasons 5 and 12, a locker room, an AV room, a break-room, and stairs leading to a second floor, housing the office of the Director and Assistant Director (until D.B. Russell’s appointment in which the Night Shift Supervisor’s Office is used as the Director’s office also). It is also believed to house the offices of the Day-shift and Swing-shift supervisors.