The Smyrna Police Department or "CID" is unique to other Detective Divisions, in area law enforcement agencies, in that most have a separate narcotics division. The Smyrna Police Department's CID currently has nine detectives and one investigative assistant. All investigators work all types of cases, including drug investigations. This provides more manpower and better information-sharing. Drug investigations are sometimes linked with other types of crimes, also. All detectives are trained to do both.

Also new to CID is the designation of two patrol officers as crime scene investigators. Officer Robert Jacobs and Officer Shane Prater have received extensive training in investigating crime scenes. They still serve in patrol, but also respond to crime scenes when needed. Both were selected for this designation because of their interest in, and abilities for, this area. With the help of County Executive Nancy Allen, and the Rutherford County Ambulance Service, a used ambulance was donated to the Police Department, that was turned into the Crime Scene Unit. The Police Department appreciates their assitance and generosity.

The detectives come from a variety of backgrounds and work experiences. All of them started in the Patrol Division. Annual training is required for all police officers. CID mostly seeks specialized training in current trends in crime. Examples of this are: identity theft and investigating methamphetamine laboratories.