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Criminal Investigation Division

The Criminal Investigation Division (C.I.D.) conducts in depth investigations into major crimes that occur in Dubuque County. Investigators have received extensive training in crime scene processing, evidence handling, death investigations, and interview and interrogation. Among the crimes most frequently investigated by the division are sexual assaults, child and dependent adult abuse, burglary, arson, and financial crimes.

Investigators work closely with the Dubuque County Attorney’s Office as well as the United States Attorney’s Office for the Northern District of Iowa in the preparation of cases for prosecution, and as such are expected to have extensive knowledge of the rules of evidence and search and seizure.

The Dubuque County Sheriff’s Office is an affiliate of the Iowa Internet Crimes Against Children Task Force (Iowa ICAC). For more information regarding Internet safety, please visit the National Center for Missing and Exploited Children’s website at You can report suspicious internet activity by clicking on the Cyber Tip-line Link or by visiting the Iowa ICAC website at

Duties: Major Crime Investigations Evidence Room
 Forensic Crime Scene Processing Narcotics Investigations
 Computer Crimes/Identity Theft Child/Dependent Adult Abuse
 Polygraph Examinations Internal Theft
 Online Child Enticement Death Investigations
 Arson Investigations Sexual Abuse Investigations
 Missing Persons Drug Endangered Children
 White Collar Crimes Felony Theft

The CID unit is staffed by a Captain, Sergeant, three (3) CID Investigators, one (1) ICAC investigator and two (2) narcotic investigators. If you have any questions about investigations, please call the Captain at 563-589-4402 or the Sergeant at 563-587-3804.