Established: 03/88
FLSA: Non-Exempt
EEO: 4



Under direction, to perform technical and analytical work in gathering, identifying and analyzing criminal evidence as a means for the arrest and conviction of criminals; to investigate crime scenes for collection, identification, and processing of physical evidence; to discover, identify, and process latent fingerprints; to photograph and perform standard chemical treatments to collected evidence; to attend autopsies to collect physical evidence; to provide expert testimony in courts regarding physical evidence; to conduct in-service roll call training in methods and procedures of collecting and identifying physical evidence; and to do other work as required.


The Sheriff's Department provides police protection and law enforcement services to the residents of Clackamas County by enforcing the laws of the State of Oregon. The Department is organized into four major divisions: the Civil Division; Operations Division; Service Division; and Corrections Division. This position is assigned to the Service Division and works closely with the Operations Division, Detective section. The Evidence Technician may functionally supervise or train assigned Deputy Sheriffs.

The Evidence Technician is a highly specialized function involving the identification, preservation, and analysis of physical evidence. The Evidence Technician is differentiated from the Detective classification in that the former is a specialized, scientific investigation subfunction of the more generalized investigations performed by the Detective classification. The Evidence Technician differs from the Sergeant classification which has an ongoing responsibility to act as supervisor or leadworker for a team of law enforcement professionals. The Evidence Technician is distinguished from Deputy Sheriff, Detective, and Sergeant, by the degree of technical specialization of duties as well as a greater responsibility for the precise collection, preservation, and examination of physical evidence and the presentation of that evidence in courts of law.


Duties may include but are not limited to the following:

  1. Examines and evaluates latent fingerprints submitted as evidence to determine sufficient ridge detail for identification purposes; files latent prints under pattern types and by case numbers; compares latent fingerprints against ink print cards; classifies, and searches latent and ink fingerprints through a computer fingerprint retrieval system.
  2. Investigates crime scenes for latent fingerprints; searches crime scenes and collects physical evidence; makes plastic or latex casts of impressions such as tool marks, tire marks, foot prints; properly identifies, marks and transports physical evidence to property control; photographs crime scene physical evidence; uses photography equipment and related crime scene equipment.
  3. Examines the physical evidence for latent fingerprints using regular and macrophotography, fingerprint dust and fingerprint brushes, chemical treatments including iodine, ninhydrin, silver nitrate, super glue, etc.
  4. Attends autopsies to record injuries and other items of evidence with photographs, and records the finger-palm prints of the deceased for identification purposes; takes gun shot residue samples; takes fingernail scrapings as required; examines cadaver's remains in various degrees of decomposition utilizing various techniques appropriate for the condition of the cadaver.
  5. Provides expert witness testimony in courts of law regarding fingerprint and palm print identification; prepares evidence exhibits for prosecution of cases.
  6. Conducts in-service roll call training for police personnel in the methods and techniques of police identification, procedures and preservation of evidence, and information on changes in techniques and technology including photography, fingerprint investigation, and crime scene investigation techniques.


Considerable knowledge of: Criminal investigation theories, techniques, procedures and practices for collection, preservation, and identification of physical evidence and its use in the courts system; principles, methods, techniques of taking and classifying fingerprints; court procedures and the rules of evidence in criminal law.

Knowledge of: Operating principles, techniques, processes, and materials used in photography, photoprocessing, and related reproduction work; safety procedures used in working with fingerprint materials and chemicals; basic computer operating methods and procedures; crime definitions, elements of crimes, and court procedures.

Skill to: Analyze situations accurately and make sound decisions; organize, analyze and present data with scientific accuracy; operate photographic equipment, magnifying equipment, printing equipment, and perform limited chemical analysis; reproduce finger and palm prints from bodies in different degrees of decomposition; testify effectively in a court of law; instruct police officers in evidence identification techniques; establish and maintain effective working relationships; effectively communicate, both orally and in writing; prepare accurate reports.


Must successfully pass an extensive background investigation including national fingerprint records check.

Must pass a pre-employment drug test.

Driving is required for County business on a regular basis or to accomplish work. Incumbents must possess a valid driver's license, and possess and maintain an acceptable driving record throughout the course of employment.


Any satisfactory combination of experience and training that would demonstrate possession of the required knowledge and skills.