ATP 3-39.12-1 — Law Enforcement Investigations, Volume I (this Item Is Published W/ Basic Incl C1)

ATP 3-39.12-1 governs Army law enforcement investigations, including evidence, interviews, crime scenes, surveillance, and specialized crime investigations.

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  • Publication number: ATP 3-39.12-1
  • Title: LAW ENFORCEMENT INVESTIGATIONS, VOLUME I (THIS ITEM IS PUBLISHED W/ BASIC INCL C1)
  • Date: 04/12/2024
  • Proponent: T2COM
  • Status: ACTIVE

View ATP 3-39.12-1 on armypubs.army.mil


It covers physical evidence, law enforcement interviews, crime scene processing, surveillance, death, assault, sex crime, property, fraud, drug, and collision investigations. It requires documentation of evidence, chain of custody, forensic analysis, reasoning, hypotheses, and the final reconstruction in the investigative report.

Topics covered

  • Physical evidence collection
  • Law enforcement interviews
  • Crime scene reconstruction
  • Physical surveillance
  • Drug crime investigations
  • Collision investigations

Questions and answers

What must be documented during crime scene analysis and reconstruction?

Documentation occurs throughout the process. (paragraph 4-148)

Why is thorough documentation important in crime scene reconstruction?

Thorough documentation ensures that the theory developed to explain the events involved in the incident stand up to scrutiny. (paragraph 4-148)

What evidence and reasoning must be documented in a reconstruction?

All evidence and reasoning applied to formulate and test hypotheses and to develop the final reconstruction of events should be documented, including those items of evidence that may not support the conclusions made by the investigator. (paragraph 4-149)

What does the Controlled Substances Act regulate?

The CSA regulates the manufacture and distribution of all legal and illegal drugs and places all substances regulated under existing federal law into one of five schedules. (paragraph 11-5)

What are the elements for wrongful possession or use of a controlled substance?

The elements for wrongful possession, use, distribution, manufacture, or introduction of a controlled substance are very simple; they are that the accused possessed, used, distributed, manufactured, or introduced a certain amount of a controlled substance and that the possession, use, distribution, manufacture, or introduction by the accused was wrongful. (paragraph 11-6)

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