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Criminal Investigations Division

The Criminal Investigations Division (CID) is under the command of Captain Jane Imming. The Division is managed and supervised by two Lieutenants and five Sergeants.  Each Bureau and Unit within the Division has specific roles and are equally important in bringing investigations to successful conclusions.

The Division has five Units: Special Victims Unit, Major Case Unit, Property Crimes Unit, Gun Investigations Unit, and the Narcotics Investigations Unit. Each is supervised by a Sergeant.  

The Criminal Investigation Division has developed a reputation for conducting thorough and exhaustive investigations and prides itself in providing the citizens of Davenport with the highest level of service and protection for the community.

If you have any questions regarding this division, please contact Captain Jane Imming at 563-326-6109 or [email protected].

Detective Bureau

The largest Bureau in this Division is the Detective Bureau, which consists of two Lieutenants, five Sergeants, and twenty-seven(27) working detectives, who are highly trained in conducting all types of investigations. Robberies, homicides, burglaries and child abuse are just a few of the areas in which Davenport's detectives are trained.

The Detective Bureau initiates proactive criminal investigations and conducts follow-up investigations on all criminal offenses ensuring that cases are complete and properly prepared for prosecution.

The Detective Bureau is made up of investigators dealing with every level of investigations. Investigators are trained through experience and education developing expertise in specific types of crime.

The following Units are included in the Detective Bureau:

  1. Juvenile & Sex Crimes
    1. Juvenile Suspects
  2. Crimes Against Persons
    1. Death Investigations
    2. Robbery
    3. Assaults
    4. Arrest Warrants
    5. Polygraph
    6. Sex Offender Registry
  3. Crimes Against Property
    1. Burglary (residential & commercial)
    2. Thefts (property or person)
    3. Criminal Mischief
    4. General (trespassing, property recovery)
    5. Pawn Shop


If you have any questions regarding this service, please contact Lieutenant Brad Jensen at 563-888-3539.

Polygraph Examiner

Corporal Richard Niesen and Officer Karl Drezek serve as the Polygraph Examiners for the Davenport Police Department.

The polygraph instrument is most widely used today by law enforcement agencies in one of two ways: as part of a pre-employment screening process or as an investigative technique to help resolve criminal complaints. As an investigative tool, the polygraph can be used to verify or discredit statements, assist in obtaining truthful statements, and reveal additional investigative leads.   The polygraph is used in virtually every type of criminal investigation, including but not limited to homicides, assaults, robberies, kidnappings, burglaries and sex crimes.

The Davenport Police Department has used the polygraph instrument to verify truth since the 1960's. The first instruments used by the Department were analog, which utilized the old "ink and pen" system. The mechanical instruments have since been replaced with the computerized equipment the Department now uses to perform examinations.

As important as the instrument is the polygraph examiner. The polygraph examiner receives extensive training at an accredited Polygraph school, along with on the job training. The examiner must maintain certification by attending annual seminars and training. The Davenport Police Dept will continue to use the polygraph as an investigative tool and resource.