Revised: 02/77, 09/91
FLSA: Exempt
EEO: 4



Under direction, to investigate and analyze criminal cases to be prosecuted or presented to the grand jury; and to do other work as required.


The District Attorney's Office prosecutes crimes committed in Clackamas County and provides legal and support services to ensure expedient criminal prosecutions, child support enforcement and assistance to crime victims.

The District Attorney Investigator is a journey level classification responsible for investigating criminal cases, analyzing police reports and evidence, and assisting Deputy District Attorneys in preparing cases for trial.

The District Attorney Investigator classification differs from the District Attorney Investigator, Senior which performs work on the more complex cases, and assigns and reviews the work of investigators and clerical support personnel.


Duties may include but are not limited to the following:

  1. Conducts investigations; interviews witnesses, suspects, defendants and law enforcement personnel; photographs crime scenes; analyzes evidence findings, police reports and other records and documents; prepares written reports.
  2. Assists Deputy District Attorneys with trial preparation; gathers, assembles and reports on facts, statements, affidavits and other information for use in legal actions; obtains additional witnesses and/or evidence; may testify in court concerning investigative findings; may serve subpoenas.
  3. Analyzes assigned police reports, investigations and complaints; examines evidence to determine if it supports criminal charges; ensures all investigative leads have been exhausted; makes recommendations as to whether case meets standards for prosecution.


Working knowledge of: Methods and techniques of criminal investigation and identification and preservation of evidence; procedures of the criminal justice system; investigative procedures and resources of local law enforcement agencies; basic techniques of photography, fingerprinting, recordkeeping and reporting; statutes and related case law on evidence, death investigations, arrests for probable cause, search and seizure subpoenas and court orders.

Some knowledge of: Serology and related medical analysis practices; firearms and ballistics; crime lab procedures; forensic pathology and autopsy procedures; bar press guidelines.

Skill to: Communicate effectively, both orally and in writing; obtain information and evidence through observation, examination of records, interviews with witnesses, victims and suspects; analyze police reports; prepare clear and concise reports, correspondence and affidavits; testify clearly, thoroughly and credibly in court and before the grand jury; analyze and respond quickly to emergency situations; develop and maintain effective working relationships with law enforcement personnel, government officials, County employees, the media and the public; photograph crime scenes; perform arrests; transport witnesses and prisoners; implement security procedures.


Duties outside the office setting require walking, standing, squatting, bending, balancing, fine motor control, and may involve exposure to slippery and/or uneven surfaces, adverse weather conditions, and unpleasant elements at crime/death scenes.


Availability on an "on call" basis.

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.


Two years of criminal investigation experience at the Detective level OR any satisfactory combination of experience and training that demonstrates possession of the required knowledge and skills.

Edited: 08/16