The increasing complexity and specialization of the District Attorney Investigator’s job requires that instructional content and teaching methodologies in the Investigation and Trial Preparation Course be regularly evaluated and updated. Effective initial training is crucial if a District Attorney Investigator is to acquire the requisite knowledge, skills, and abilities to provide quality service to the public. The goal of this document, developed by the California Commission on Peace Officer Standards and Training (POST), is to identify the instructional goals, required learning objectives, instructional activities, tests, and minimum hourly requirements that comprise the required content of the Investigation and Trial Preparation Course. The document is divided into 20 sections, 1 for each specific learning domain. Each section has six parts: 1) Learning Need; 2) Learning Objectives; 3) Required Tests: 4) Required Instructional Activities; 5) Hourly Requirements; and 6) Origination Date. The 20 learning domains for this course are: 1) Role of the District Attorney Investigator; 2) Court Processes, Motions, Grand Jury; 3) Civil Process; 4) Concepts of Evidence, Search and Seizure; 5) Investigative Techniques; 6) Victim, Witness and Informant Management; 7) Trial Preparation and Support; 8) Family Support Investigations; 9) Child Abduction Investigations; 10) Financial Crimes Investigations; 11) Public Assistance Fraud Investigations; 12) Crimes Committed by Public Officials; 13) Special Victim Investigations; 14) Gang Activity Investigations; 15) Officer Involved Investigations; 16) Environmental Crime Investigations; 17) Investigator Safety; 18) Surveillance; 19) Ethics and Professionalism; and 20) High Tech Crimes and Computers.