Sheriff's Identification Unit

Sheriff's Identification Unit Fingerprint

The mission of the Sheriff’s Identification Unit (SIU) is to provide quality and timely friction ridge examination services in an unbiased, ethical, and effective manner to our customer agencies and divisions. Our purpose is to adhere to the highest quality standards in order to maintain the highest level of public trust.

The SIU performs a number of critical services for the citizens of the County of Santa Clara. In addition to providing support services directly to the Santa Clara County Sheriff's Office, SIU also provides fingerprint comparison and identification services to the other Police Departments and Law Enforcement Agencies across the County. Notable end users of SIU's services include the District Attorney's Office, Public Defender's Office and the Medical Examiner – Coroner's Office. The SIU performs an integral role in contributing to the public safety of the citizens of this County. SIU's primary responsibility is the analysis, comparison and evaluation of finger and palm prints obtained from crime scenes – known as “latent prints” – for the purposes of identifying the source of them. SIU processes 1000 latent print cases per year on average, developing investigative leads for Detectives and Attorneys. SIU staff routinely produce scientific reports, provide latent comparison evidence for the local and federal court systems, and are often required to testify in court to their findings.

SIU also performs the core function of confirming the identity of arrestees for all policing agencies in Santa Clara County. At the time of criminal arrest, an arrestee's finger and palm prints are taken electronically on machines called “Live Scans”. These arrest prints are known as “ten prints”. Ten prints are searched and stored in the Santa Clara County Automated Fingerprint Identification System (AFIS) database. SIU is responsible for the searching, accurate identification, and database maintenance of AFIS for all ten prints collected within Santa Clara County. Santa Clara County's AFIS receives over 60,000 criminal bookings per year.

The third key service that SIU provides to the community is the identification, via fingerprints, of deceased persons for the Santa Clara County Office of the Medical Examiner – Coroner. This crucial function is particularly important for deceased persons whom are indigent, have no available next of kin, are homicide victims, or whom are otherwise not viewable due to trauma. SIU identify on average more than 600 deceased persons for the Medical Examiner - Coroner every year – around 1000 deceased persons during the COVID19 pandemic.

Additionally, SIU members process exhibits using chemical development and enhancement techniques in order to image latent prints, and may attend crime scenes when required to assist in developing and enhancing latent prints. SIU staff possess a wealth of specialized knowledge, training and experience in order to perform these vital functions.

The citizens of Santa Clara County can expect an exceptionally high standard of work product from SIU. The unit has been accredited to an international standard (ISO 17020) since 2018, and requires its examiners to obtain individual certification from the International Association for Identification as Certified Latent Print Examiners (CLPEs) as part of their training. SIU's staff are actively involved in the scientific community - serving on boards, lecturing on various topics, and providing training across the United States. SIU members are often looked at as industry leaders and are well respected in their field. SIU provides vital services to the community that support and promote public safety, and the citizens of Santa Clara County can be confident in the reliability and effectiveness of those services.

General Information


When submitting latent prints to the Sheriff's Identification Unit (SIU), law enforcement representatives should use the new Sheriff's Identification Unit (SIU) latent print envelope. You may use an over-sized envelope or box to submit latent print lifts that will not fit into this envelope. Call the Sheriff's Office Identification Unit (SIU) at (408) 808-4750 to refresh your supply when needed.

Please do NOT call the Sheriff's Identification Unit (SIU) for Live Scan appointments.

Contact Fingerprint Identification Director Steven Brock


55 W. Younger Avenue (4th Floor)
San Jose, CA 95110
Phone: (408) 808-4750

©2022 County of Santa Clara. All rights reserved.