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2026-08-15 16:25:26 +02:00

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Tasks & work activities — private detective

Source: O*NET 30.3, occupation 33-3021.00 (Detectives and Criminal Investigators).

Task statements

  • [Core] Check victims for signs of life, such as breathing and pulse.
  • [Core] Obtain facts or statements from complainants, witnesses, and accused persons and record interviews, using recording device.
  • [Core] Secure deceased body and obtain evidence from it, preventing bystanders from tampering with it prior to medical examiner's arrival.
  • [Core] Record progress of investigation, maintain informational files on suspects, and submit reports to commanding officer or magistrate to authorize warrants.
  • [Core] Prepare charges or responses to charges, or information for court cases, according to formalized procedures.
  • [Core] 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] Obtain summary of incident from officer in charge at crime scene, taking care to avoid disturbing evidence.
  • [Core] Note, mark, and photograph location of objects found, such as footprints, tire tracks, bullets and bloodstains, and take measurements of the scene.
  • [Core] Prepare reports that detail investigation findings.
  • [Core] Examine records and governmental agency files to find identifying data about suspects.
  • [Core] Secure persons at scene, keeping witnesses from conversing or leaving the scene before investigators arrive.
  • [Core] Provide information to lab personnel concerning the source of an item of evidence and tests to be performed.
  • [Core] Analyze completed police reports to determine what additional information and investigative work is needed.
  • [Core] Obtain and verify evidence by interviewing and observing suspects and witnesses or by analyzing records.
  • [Core] Prepare and serve search and arrest warrants.
  • [Core] Question individuals or observe persons and establishments to confirm information given to patrol officers.
  • [Core] Identify case issues and evidence needed, based on analysis of charges, complaints, or allegations of law violations.
  • [Core] Participate or assist in raids and arrests.
  • [Core] Organize scene search, assigning specific tasks and areas of search to individual officers and obtaining adequate lighting as necessary.
  • [Core] Summon medical help for injured individuals and alert medical personnel to take statements from them.
  • [Core] Notify command of situation and request assistance.
  • [Core] Testify before grand juries concerning criminal activity investigations.
  • [Core] Block or rope off scene and check perimeter to ensure that entire scene is secured.
  • [Core] Notify, or request notification of, medical examiner or district attorney representative.
  • [Core] Search for and collect evidence, such as fingerprints, using investigative equipment.
  • [Core] Determine scope, timing, and direction of investigations.
  • [Core] Maintain surveillance of establishments to obtain identifying information on suspects.
  • [Core] Collaborate with other offices and agencies to exchange information and coordinate activities.
  • [Core] Perform undercover assignments and maintain surveillance, including monitoring authorized wiretaps.
  • [Core] Examine records to locate links in chains of evidence or information.

Detailed work activities

  • Analyze crime scene evidence.
  • Apprehend criminal suspects.
  • Block physical access to restricted areas.
  • Check physical condition of people or animals.
  • Collaborate with law enforcement or security agencies to share information.
  • Collect evidence for legal proceedings.
  • Communicate situation details to appropriate personnel.
  • Detain suspects or witnesses.
  • Determine operational procedures.
  • Direct criminal investigations.
  • Document legal or regulatory information.
  • Examine crime scenes to obtain evidence.
  • Examine records or other types of data to investigate criminal activities.
  • Interview people to gather information about criminal activities.
  • Investigate accidents to determine causes.
  • Maintain surveillance of individuals or establishments.
  • Observe individuals' activities to gather information or compile evidence.
  • Prepare investigation or incident reports.
  • Prevent unauthorized individuals from entering restricted areas.
  • Process forensic or legal evidence in accordance with procedures.
  • Record crime or accident scene evidence with video or still cameras.
  • Record information about suspects or criminals.
  • Request emergency personnel.
  • Serve court ordered documents.
  • Testify at legal or legislative proceedings.
  • Use databases to locate investigation details or other information.