The Sheriff's department is the New California Republic's central law enforcement center and is complete with offices, a locker room and detention cells. It is occupied by three police officers at all times, including Deputy Karl. It is important for the quest Retrieve Parts/Gain Access to Vault 15 as one of the squatters is detained in a cell. Talking to the deputy with Tandi's permission to 'interrogate' him will grant you access. He will give you no information until physical contact is made, for example punching him in the face, and then claiming that no-one will save him will cause him to give the Chosen One their desired information.