The Investigative Services Bureau are the primary investigative components of the Norwalk Department of Police Service. The bureau is comprised of the Detective Division, Youth Division and Special Services Division.

Detective Division
The Detective Division is under the command of a Lieutenant. The organizational structure of the division includes three squads of detectives, each supervised by a Sergeant, assuring coverage from 8am until midnight, seven days a week.

The division is required to assume responsibility for all felonies where a follow-up investigation is required and necessary, any misdemeanors where a follow-up investigation is deemed necessary by the detective supervisor, and any other matter determined by the Chief of Police to be appropriate.
Most Part I category crimes (Murder, Robbery, Sexual Assault, Burglary, Arson, Larceny and Stolen Motor Vehicles) are investigated by the detectives in this unit.

Realizing cooperation and coordination among various law enforcement agencies is essential to reducing the level of crime and solving crimes where they do occur, the Detective Bureau cooperates with other city, state and federal agencies in investigating incidents utilizing task forces or other cooperative means.

To attain the rank of Detective, a Norwalk Police Officer must have a minimum of 3 years "on the job", and pass a competitive written and oral examination.

Youth Division
The Youth Division commanded by a lieutenant is responsible for the investigation of crimes involving juveniles and cases of suspected child abuse. In addition, the division provides instruction to all Norwalk 5th graders through the DARE (Drug Abuse Resistance Education) Program. The education programs are intended to improve the relationship between the Norwalk youth ad the police through a frank and open discussion of contemporary issues impacting our youth. The division also supervises the School Resource Officers (SRO's) who are assigned to the Norwalk High Schools.

Special Services Division
The Special Services Division, commanded by a lieutenant, is responsible for the investigation of narcotics violations, vice, gambling and organized crime. As in most large cities, narcotics enforcement is the priority for this unit. Long term as well as short term investigation are conducted by this unit. Targets range from high-level narcotics traffickers to sellers and buyers engaged in street-level narcotics activities. Utilizing state and federal asset forfeiture laws, thousands in cash and property is seized each year, and used to further combat the drug problem. In addition, the unit works closely with federal agencies such as the FBI, Treasury Department and Drug Enforcement Administration, as well as state and regional units such as the State-Wide Narcotics Task Force.