City of Costa Mesa
Home MenuInvestigative Services Bureau
The Investigative Services Bureau, within the Support Services Division, handles all criminal investigative functions within the Police Department. This Bureau, under the command of a Police Lieutenant, is comprised of several elements with investigators assigned to units consisting of the Detective Investigations Unit, Special Investigations Unit, and the Crime Scene Unit.
Investigations Main phone number: (714) 754-5637
Detective Investigation Unit
Special Investigators Unit (S.I.U.)
Gang Unit
The Gang Unit is staffed by four Gang Officer and three School Resource Officers under the supervision of a Sergeant. This unit handles crimes and investigations that effect schools and/or involve gangs.
Sgt. J. Tripp – jtripp@costamesaca.gov
(714) 754-5093
Crime Scene Unit
Investigations Bureau Commander: Lt. Michelle Bradbury
Lieutenant Michelle Bradbury oversees Investigative Services Division, which includes Crime Scene Investigations, the Gang Unit, Special Enforcement Bureau, and the Investigative Services Bureau. She has served the Costa Mesa Police Department for 23 years. She has worked various details, including School Resource Officer, Detectives, Field Training Officer, and Sergeant in charge of the Training and Recruitment Bureau. She has a bachelor’s degree from California State University Dominguez Hills. She became the Lieutenant of Investigative Services Division in 2025.
(714) 754-5675