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NM POST: Patrol Operations and Traffic Enforcement

NM POST · Work through your exam, one topic at a time.

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Patrol Operations and Traffic Enforcement

This domain tests lawful traffic stops, DWI detection and enforcement, crash-scene management, and officer safety during patrol contacts.

Core rules

  • A traffic stop is a seizure requiring reasonable suspicion of a traffic violation or criminal activity. The stop is valid if the violation is objectively present, even if the officer had another motive.
  • DWI detection has three phases: vehicle in motion, personal contact, and pre-arrest screening. Standardized field sobriety tests are the horizontal gaze nystagmus, walk-and-turn, and one-leg stand. Clues are counted under NHTSA protocols, and deviations from standardized administration reduce reliability.
  • New Mexico's Implied Consent Act (NMSA 1978, § 66-8-105 et seq.) requires drivers to submit to chemical testing after arrest; refusal carries administrative and evidentiary consequences. Aggravated DWI includes a blood-alcohol level of .16 or more and refusal to submit (NMSA 1978, § 66-8-102(C)).
  • At crashes, protect the scene first, request medical aid, control traffic, identify hazards, and then document positions, damage, injuries, and statements. Photograph before moving vehicles if safe.
  • Emergency driving requires emergency equipment and due regard for public safety; the privilege is not absolute.

Worked example

At 2 a.m., an officer sees a car weave across the fog line twice, then stop in a travel lane. The officer activates emergency equipment and approaches. The driver has bloodshot, watery eyes, slurred speech, and an odor of alcohol. The officer administers HGN, WAT, and OLS and observes six, four, and two clues. The driver refuses a breath test. The initial stop is supported by reasonable suspicion of weaving. The driving, personal contact, and SFST clues establish probable cause for DWI. The refusal supports an aggravated DWI charge and implied-consent consequences.

Traps that cost marks

  • Treating SFST clues as a conviction rather than evidence of impairment.
  • Administering SFSTs on unsafe slopes, in traffic, or without proper instruction.
  • Forgetting to document the three DWI phases separately.
  • Letting evidence collection delay medical aid or scene safety.