Guard inmates in penal or rehabilitative institutions in accordance with established rules and procedures. May guard prisoners in transit between jail, courtroom, prison, or other level. Includes deputy sheriffs and police who spend nearly all of their time guarding prisoners in correctional establishments. Inspect buildings to detect fire hazards and implement local ordinances and state legal guidelines, or investigate and gather information to determine reason for fires and explosions. Feed, water, and examine pets and different nonfarm animals for signs of sickness, illness, or injury in laboratories and animal hospitals and clinics. Clean and disinfect cages and work areas, and sterilize laboratory and surgical equipment.