# Detectives and Criminal Investigators > Conduct investigations related to suspected violations of federal, state, or local laws to prevent or solve crimes. - Code: 33-3021.00 (O*NET-SOC; SOC 2018 33-3021) - Family: [Protective Service](https://foundation.org.ai/occupations#family-33), one of its 28 occupations - Tasks: 30 tasks (30 core) - Page: https://foundation.org.ai/occupations/33-3021.00 - JSON: https://foundation.org.ai/data/tasks/33-3021.00.json ## What the work is made of 1. Check victims for signs of life, such as breathing and pulse. Core task · Task 23021 · Rated by 159 people who do the job, August 2022 2. Obtain facts or statements from complainants, witnesses, and accused persons and record interviews, using recording device. Core task · Task 23022 · Rated by 155 people who do the job, August 2022 3. Secure deceased body and obtain evidence from it, preventing bystanders from tampering with it prior to medical examiner's arrival. Core task · Task 23023 · Rated by 153 people who do the job, August 2022 4. Record progress of investigation, maintain informational files on suspects, and submit reports to commanding officer or magistrate to authorize warrants. Core task · Task 23024 · Rated by 154 people who do the job, August 2022 5. Prepare reports that detail investigation findings. Core task · Task 23029 · Rated by 87 people who do the job, August 2022 6. Prepare charges or responses to charges, or information for court cases, according to formalized procedures. Core task · Task 23025 · Rated by 154 people who do the job, August 2022 7. Preserve, process, and analyze items of evidence obtained from crime scenes and suspects, placing them in proper containers and destroying evidence no longer needed. Core task · Task 23026 · Rated by 158 people who do the job, August 2022 8. Obtain summary of incident from officer in charge at crime scene, taking care to avoid disturbing evidence. Core task · Task 23027 · Rated by 155 people who do the job, August 2022 9. Note, mark, and photograph location of objects found, such as footprints, tire tracks, bullets and bloodstains, and take measurements of the scene. Core task · Task 23028 · Rated by 155 people who do the job, August 2022 10. Examine records and governmental agency files to find identifying data about suspects. Core task · Task 23030 · Rated by 154 people who do the job, August 2022 11. Secure persons at scene, keeping witnesses from conversing or leaving the scene before investigators arrive. Core task · Task 23031 · Rated by 155 people who do the job, August 2022 12. Provide information to lab personnel concerning the source of an item of evidence and tests to be performed. Core task · Task 23032 · Rated by 153 people who do the job, August 2022 13. Analyze completed police reports to determine what additional information and investigative work is needed. Core task · Task 23033 · Rated by 155 people who do the job, August 2022 14. Examine records to locate links in chains of evidence or information. Core task · Task 23050 · Rated by 86 people who do the job, August 2022 15. Search for and collect evidence, such as fingerprints, using investigative equipment. Core task · Task 23045 · Rated by 87 people who do the job, August 2022 16. Prepare and serve search and arrest warrants. Core task · Task 23035 · Rated by 155 people who do the job, August 2022 17. Question individuals or observe persons and establishments to confirm information given to patrol officers. Core task · Task 23036 · Rated by 153 people who do the job, August 2022 18. Determine scope, timing, and direction of investigations. Core task · Task 23046 · Rated by 86 people who do the job, August 2022 19. Obtain and verify evidence by interviewing and observing suspects and witnesses or by analyzing records. Core task · Task 23034 · Rated by 87 people who do the job, August 2022 20. Participate or assist in raids and arrests. Core task · Task 23038 · Rated by 155 people who do the job, August 2022 21. Organize scene search, assigning specific tasks and areas of search to individual officers and obtaining adequate lighting as necessary. Core task · Task 23039 · Rated by 155 people who do the job, August 2022 22. Summon medical help for injured individuals and alert medical personnel to take statements from them. Core task · Task 23040 · Rated by 154 people who do the job, August 2022 23. Notify command of situation and request assistance. Core task · Task 23041 · Rated by 155 people who do the job, August 2022 24. Block or rope off scene and check perimeter to ensure that entire scene is secured. Core task · Task 23043 · Rated by 159 people who do the job, August 2022 25. Identify case issues and evidence needed, based on analysis of charges, complaints, or allegations of law violations. Core task · Task 23037 · Rated by 87 people who do the job, August 2022 26. Notify, or request notification of, medical examiner or district attorney representative. Core task · Task 23044 · Rated by 158 people who do the job, August 2022 27. Collaborate with other offices and agencies to exchange information and coordinate activities. Core task · Task 23048 · Rated by 86 people who do the job, August 2022 28. Maintain surveillance of establishments to obtain identifying information on suspects. Core task · Task 23047 · Rated by 155 people who do the job, August 2022 29. Testify before grand juries concerning criminal activity investigations. Core task · Task 23042 · Rated by 87 people who do the job, August 2022 30. Perform undercover assignments and maintain surveillance, including monitoring authorized wiretaps. Core task · Task 23049 · Rated by 87 people who do the job, August 2022 ## More in Protective Service - [Animal Control Workers](https://foundation.org.ai/occupations/33-9011.00): 15 tasks - [Bailiffs](https://foundation.org.ai/occupations/33-3011.00): 15 tasks - [Correctional Officers and Jailers](https://foundation.org.ai/occupations/33-3012.00): 27 tasks - [Crossing Guards and Flaggers](https://foundation.org.ai/occupations/33-9091.00): 12 tasks - [Customs and Border Protection Officers](https://foundation.org.ai/occupations/33-3051.04): 11 tasks - [Fire Inspectors and Investigators](https://foundation.org.ai/occupations/33-2021.00): 30 tasks - [Firefighters](https://foundation.org.ai/occupations/33-2011.00): 30 tasks - [First-Line Supervisors of Correctional Officers](https://foundation.org.ai/occupations/33-1011.00): 23 tasks - [First-Line Supervisors of Firefighting and Prevention Workers](https://foundation.org.ai/occupations/33-1021.00): 30 tasks - [First-Line Supervisors of Police and Detectives](https://foundation.org.ai/occupations/33-1012.00): 20 tasks - [First-Line Supervisors of Protective Service Workers, All Other](https://foundation.org.ai/occupations/33-1099.00): no tasks listed - [First-Line Supervisors of Security Workers](https://foundation.org.ai/occupations/33-1091.00): 21 tasks - [Fish and Game Wardens](https://foundation.org.ai/occupations/33-3031.00): 24 tasks - [Forest Fire Inspectors and Prevention Specialists](https://foundation.org.ai/occupations/33-2022.00): 16 tasks - [Gambling Surveillance Officers and Gambling Investigators](https://foundation.org.ai/occupations/33-9031.00): 8 tasks - [Intelligence Analysts](https://foundation.org.ai/occupations/33-3021.06): 21 tasks - [Lifeguards, Ski Patrol, and Other Recreational Protective Service Workers](https://foundation.org.ai/occupations/33-9092.00): 15 tasks - [Parking Enforcement Workers](https://foundation.org.ai/occupations/33-3041.00): 22 tasks - [Police and Sheriff's Patrol Officers](https://foundation.org.ai/occupations/33-3051.00): 30 tasks - [Police Identification and Records Officers](https://foundation.org.ai/occupations/33-3021.02): 15 tasks - [Private Detectives and Investigators](https://foundation.org.ai/occupations/33-9021.00): 14 tasks - [Protective Service Workers, All Other](https://foundation.org.ai/occupations/33-9099.00): no tasks listed - [Retail Loss Prevention Specialists](https://foundation.org.ai/occupations/33-9099.02): 21 tasks - [School Bus Monitors](https://foundation.org.ai/occupations/33-9094.00): 18 tasks - [Security Guards](https://foundation.org.ai/occupations/33-9032.00): 14 tasks - [Transit and Railroad Police](https://foundation.org.ai/occupations/33-3052.00): 12 tasks - [Transportation Security Screeners](https://foundation.org.ai/occupations/33-9093.00): 26 tasks ## Where this comes from Quoted from O*NET 29.0, U.S. Department of Labor, Employment and Training Administration, under CC BY 4.0: free to copy and reuse, with credit. 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