Evidence Technician I (#RP4011)
$25.49-$30.98 Hourly / $4,418.12-$5,370.26 Monthly / $53,017.53-$64,443.14 Yearly


Under immediate supervision, learns to perform technical work in connection with law enforcement investigative processes; and does related or other work as required in accordance with Rule 3, Section 3 of the Civil Service Rules.


This is the entry- level class in the Evidence Technician series. An employee in this class learns to provide technical services related to the investigation and prosecution of criminal cases following well-defined methods and procedures.


  • Learns to classify, index, and file fingerprints; searches files and compares indexed fingerprints against latent, plastic, visible or photographic impressions obtained at the scene of crimes; prepares fingerprint examples for court as required. 
  • Learns to operate cameras and photographic processing equipment used in the exposures and development of photographic film and papers. 
  • Assists in photographing perishable and other evidence, personal injuries and persons for identification purposes. 
  • Obtains information from individuals regarding personal histories and criminal records. 
  • May receive, tag, store, and log evidence, found property, or property maintained for safekeeping in the property room. 
  • Learns to evaluate latent prints as to suitability for processing in the A.F.I.S. (Automated Fingerprint Identification System) system and ensure optimum performance of that system. 
  • Learns to photograph, trace, and process identifiable latent prints through the A.F.I.S. system. 
  • Evaluates the results from A.F.I.S. system and makes necessary comparisons to form a conclusion. 
  • Assists in preparing evidence for court; may testify in court. 
  • Maintains records and prepares reports.


Licenses and Certificates: Possession of a valid California Driver’s License.

Experience: Six months of paid work experience in law enforcement, fingerprint classification, or photography. 

Education: College level or approved training courses in fingerprint classification and photography.


Fingerprint classification, searching and filing methods; latent comparison and identification techniques; methods of identification, interpretation, and preservation of evidence; photographic processes including developing and printing; record keeping and filing methods.


Acquire knowledge of modern methods, practices, and techniques of police work involving criminal investigation; operate photographic and darkroom equipment; lift latent fingerprints and classify fingerprints accurately; communicate effectively, both orally and in writing; read and understand directions, regulations, and technical matters; establish and maintain effective working relationships; testify in court as an expert witness; maintain detailed criminal records and to prepare reports; acquire skill in taking photographs; acquire skill in taking, classifying, identifying, and comparing fingerprints; acquire skill in the use of computers.


San Joaquin County complies with the Americans with Disabilities Act (ADA) and, upon request, will consider reasonable accommodations to enable individuals with disabilities to perfor

CLASS: RP4011; EST: 8/14/1991;