District Attorney Investigative Sergeant (#RL3026)
$49.18-$59.78 Hourly / $8,525.21-$10,362.43 Monthly / $102,302.46-$124,349.16 Yearly


Under direction, supervises one or more operational divisions of criminal investigators and support staff and conducts the more complex or sensitive investigations of criminal and civil law matters in the District Attorney’s Office; assists with the technical and administrative operation of the Bureau of Investigation; and does related or other work as required in accordance with Rule 3, Section 3 of the Civil Service rules.


An employee of this class assists in planning, assigning, and supervising the activities of investigative functions performed by the District Attorney’s Office.  Direction is received from the District Attorney Investigative Lieutenant, Chief District Attorney Investigator, and/or other leadership of the Bureau of Investigation.

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.


  • Plan, assign, direct, and evaluate the work and performance of investigative staff; participate in the selection of staff; review and make recommendations of the work performed by subordinates.
  • Initiates corrective action as needed; implements disciplinary action as directed.
  • Train investigative staff in procedures, policies, laws, regulations and methods of techniques relating to criminal and civil investigations.
  • Make determinations and provide direction regarding the appropriate types of investigation to be conducted and procedures to be used.
  • Supervise, participate in, and investigate the more sensitive or complex criminal or civil cases, including gathering evidence, serving and executing legal papers, and preparing investigative reports.
  • Review and evaluate investigative reports and correspondence; ensure that reports submitted are accurate, relevant, and consistent with laws and regulations, that all investigative avenues have been explored and no defenses have been overlooked; make recommendations as to course of action to be taken.
  • Assist attorneys in preparing cases for court; testify in criminal and civil proceedings.
  • Maintain records, data, and statistics related to investigative work and caseloads as required. 
  • Assist in coordinating investigative activities of assigned cases with other law enforcement agencies.
  • Participate in or conduct meetings and conferences as a representative of the District Attorney’s Office; work in collaboration with community-based organizations to develop and maintain positive relations to prevent and resolve issues, gain compliance, and build trust.
  • As assigned, act in mutual aid situations, which may include active law enforcement duties; apply proper techniques of arrest; determine appropriate course of action when faced with potentially violent situations; work in an undercover capacity; may be required to assume command in the absence of the District Attorney Investigative Lieutenant.


Experience:  Two years as a District Attorney Investigator II in the San Joaquin County District Attorney Bureau of Investigation.

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

Certificate: Possession of an Advanced P.O.S.T. certificate including or supplemented by successful completion of approved courses in Powers of Arrest and use of firearms in accordance with Penal Code Section 832.  Such courses must have been approved by the California Commission on Peace Officers Standards.

Must attend and pass a P.O.S.T. – certified supervisory course within 12 months of appointment (CCR Title II, §1005).
Meet and maintain minimum standards required for peace officers as set forth in Sections 1029 and 1031 of the California Government Code.


Principles and practices of supervision, leadership, employee management, and training; techniques, methods and procedures used in crime detection and criminal investigation; rules of arrest; court and legal proceedings; community-based policing and collaborative problem solving between community residents and law enforcement; investigative techniques and procedures; civil and criminal laws, codes, and ordinances in effect in the County; rules of evidence and techniques of securing, evaluating, and preparing evidence and exhibits for trial; search and seizure; service of legal papers; legal rights of citizens; firearms safety.


Supervise  the work of subordinates; understand and perform employee counseling, remediation, and discipline; keep records and prepare, review and evaluate comprehensive investigative and business reports; interpret and apply applicable legal provisions; gather, assemble, analyze, and evaluate facts and evidence; obtain information through interviews, interrogations and observations; be honest, fair, equitable, and tactful in both pleasant and unpleasant situations; draw logical conclusions and make proper recommendations; communicate effectively using the English language, both orally and in writing; establish and maintain effective working relationships with other investigators, law enforcement officials, the public and others.


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

CLASS: RL3026; EST: 11/8/2023;