District Attorney Investigator Trainee (#RL3000)
$33.32-$40.50 Hourly / $5,774.82-$7,019.33 Monthly / $69,297.93-$84,232.07 Yearly


Under immediate supervision, learns to investigate alleged and suspected violations of criminal and civil law falling within the jurisdiction of the District Attorney’s Office; makes recommendations for actions to be taken; and does related or other work as required in accordance with Rule 3, Section 3 of the Civil Service Rules.


This is the trainee level within the District Attorney Investigator series.  Initially, employees learn to conduct investigations and work is closely reviewed and supervised.  As knowledge and experience are gained, employees are expected to work more independently.  Work may involve an element of personal danger and may entail long hours of work at unusual times of the day or night.

Employees of the District Attorney Investigator series are statutory full-time peace officers and have a duty to act upon criminal violations occurring in their presence.  Employees are peace officers as defined by Section 830.1 of the Penal Code.


  • Learns to conduct investigations of civil and criminal matters such as consumer and welfare fraud, misconduct of public officials, homicides, embezzlement, suspected violations of corporate security laws and mental health matters; conducts investigations requested by the Grand Jury; and investigates failure to provide cases.
  • Learns to interview and question accused or suspected individuals and witnesses; examines court, police, public and governmental records needed for investigations; records and evaluates information obtained.
  •  Learns to inspect crime scenes to locate, identify, assemble, preserve, record and evaluate information.
  • Learns to establish and maintain contact with informants; gather intelligence information concerning alleged criminal activities.
  • Learns to assemble and prepare evidence for presentation in court; assists attorneys in court; gives testimony in court.
  • Learns to analyze and evaluate the results of investigations in light of recent court decisions; reviews reports of other law enforcement agencies to determine if all investigative avenues have been explored; detects defenses, which may have been overlooked.
  • Makes oral and written reports.
  • Serves legal papers such as subpoenas, warrants and summonses; serves and executes extradition papers.
  • Assists in coordinating the investigative activities of the District Attorney’s Office with local, state and federal law enforcement agencies.
  • Develops and maintains positive relationships with the public to gain compliance and trust; fosters collaborative partnerships with community members and organizations.
  • Learns to negotiate and arrange for repayment of fraudulently obtained funds.
  • As assigned, acts in mutual aid situations which may include active law enforcement duties; applies proper techniques of arrest; determines appropriate course of action when faced with potentially violent situations; works in an undercover capacity.


License:  Possession of a valid California C driver’s license.


Certificates:  Possession of a current Basic POST Academy Completion Certificate.


Special Requirements:

  1. Be at least 21 years of age upon appointment.
  2. Meet minimum standards required for Peace Officers as set forth in Section 1029 and 1031 the Government Code.
  3. Pass background investigation.
  4. Meet physical standards established for safety members.


Basic social aspects of law enforcement; general human behavior; the use and care of firearms; arrest techniques; the laws of arrest, search, and seizure; rules of evidence, public relations principles; language usage and mechanics; first aid.


Learn to gather, assemble, analyze and evaluate facts and evidence; interpret and fairly and equitably apply legal provisions; obtain information through questioning and observation; draw logical conclusions and make proper recommendations; analyze situations and adopt effective courses of action; prepares comprehensive reports on investigations; learn to operate specialized investigative equipment; express oneself clearly and concisely, both orally and writing; establish and maintain effective working relationships with other investigators, law enforcement’s officials, the public and others.

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

CLASS: RL3000; EST: 3/10/1999; REV: 11/30/2022;