The division is comprised of 13 units and task forces

The primary function of the ISD is to

• Aggressively investigate crimes within the primary jurisdiction of the Westchester County Police
• Provide specialized assistance when requested to local Westchester County law enforcement agencies for problematic, long-range, large-scale or complex investigations.
   

ISD Units include:

• General Investigations Unit
• Forensic Investigations Unit
• Narcotics Unit
• Warrant-Fugitive Unit
• Crime Analysis Unit

ISD detectives also serve on a number of multi-agency task forces, including:

• Drug Enforcement Administration Task Force
• FBI Violent Crimes Task Force
• U.S. Marshal’s Fugitive Task Force
• Westchester District Attorney’s Auto Crimes Task Force.