The Investigative Services Division of the Nebraska State Patrol includes three areas of concentration: drug investigation, criminal investigation and liquor enforcement. The Investigative Services Division in Troop D-North Platte has one Lieutenant, two Sergeants, and eight Investigators. Civilian employees are also a critical component of the Investigative Services Division helping with intelligence gathering, evidence and report processing.

Criminal Investigators with Troop D work cases ranging from theft to homicides with emphasis placed on assisting local law enforcement agencies with major criminal investigations.

The Troop D Drug Division is an integral component of the Cooperative Operations for Drug Enforcement (CODE) Drug Task Force which is comprised of city, county and federal investigators, analysts and prosecutors. The task force operates in west central and southwestern Nebraska.