Performs crime investigation and analysis; secures crime scenes and interviews and interrogates suspects and witnesses; preserves, analyzes and evaluates evidence; takes measurements and draws diagrams of crime and accident scenes; searches scene of crimes for clues; arrests persons involved in crimes and. Performs specialized functions in areas of expertise, including general and specialized training, K-9, SWAT, community outreach, crime prevention, event security, warrant service, computer systems, armory and other special enforcement, assessment, surveillance, intervention, investigative and inter-agency teams.