Louisiana DWI field-sobriety evidence
Compare recorded instructions and performance with actual conditions, health, comprehension, and the officer's claimed interpretation.
Source review: October 16, 2026What this pathway evaluates
Roadside exercises are evidence, not a self-proving verdict. A useful review compares the report to the complete video, the exact instructions given, the surface and environmental conditions, the person's footwear and physical condition, and the officer's training and scoring.
Horizontal-gaze nystagmus, walk-and-turn, one-leg stand, and nonstandard tasks do not all raise identical foundation questions. Determine which exercises occurred, what the officer claims each demonstrated, and whether the video supports the described observations.
Alternative explanations must be documented. Age, injury, vestibular problems, neuropathy, fatigue, anxiety, language, hearing, footwear, slope, lighting, and weather can matter, but the existence of a condition alone does not prove that it caused a particular performance.
Issue map
Instructions
Transcribe the actual instructions, demonstrations, questions, interruptions, and opportunities to clarify. Compare them with the method the officer says was used.
Conditions
Document surface, grade, traffic, lighting, precipitation, wind, footwear, restraints, vehicle lights, and camera angle. Use neutral measurements and photographs where possible.
Physical and communication factors
Preserve contemporaneous complaints, EMS observations, diagnoses, prescriptions, language needs, hearing issues, and video evidence of comprehension.
Weight versus exclusion
A deviation may affect credibility or weight without automatically requiring exclusion. Expert testimony or a foundation hearing may be necessary for a technical challenge.
Questions this route should answer
Is poor balance automatically proof of impairment?
No. It is one observation evaluated with the instructions, conditions, health, video, driving, statements, and other evidence.
Does imperfect administration automatically exclude the tests?
Not necessarily. The legal consequence depends on the deviation, governing foundation, reliability, prejudice, and the purpose for which the evidence is offered.
Should I recreate the exercises later?
A later recreation can differ materially from the incident and can create misleading evidence. Preserve the original conditions and obtain qualified guidance before any testing.
Primary sources
These links are starting points, not a substitute for reading the current law, court orders, and the complete record.