Medically Unable to Complete a Breath Test in a New Jersey DWI Case

Refusal Charges Assume You Were Physically Able to Comply

New Jersey's refusal law, N.J.S.A. 39:4-50.4a, penalizes declining to submit to a breath test after being arrested for DWI, separately from the underlying DWI charge itself. Built into that law is an assumption: that the driver was physically capable of giving a valid sample and chose not to. When that assumption doesn't hold — when a real, documentable medical condition made it physically impossible to produce an adequate sample — the case isn't really about refusal at all. It's about incapacity, and incapacity is treated as a defense to the refusal charge rather than an aggravating detail.

This distinction matters because a refusal conviction in New Jersey carries its own separate penalties on top of whatever happens with the underlying DWI. Establishing that a failed breath test wasn't a refusal at all can remove that separate exposure — though, as covered below, it doesn't make the whole case disappear.

Medical Conditions That Commonly Come Up

Respiratory and pulmonary conditions are the ones most often raised, because the Alcotest requires a sustained, adequate volume of airflow that some conditions genuinely prevent:

• Asthma, COPD, and emphysema — conditions that limit lung capacity or make a long, steady exhale difficult or impossible on a bad day.
• Chest or rib injuries from the same incident that led to the stop, or from an unrelated recent injury.
• Dental conditions or appliances that interfere with forming a seal around the mouthpiece.
• Panic or acute anxiety responses, which are harder to document convincingly but have been raised in some cases.

None of these excuse the underlying situation automatically. They go to a specific, narrow question: was a failure to produce an adequate sample the result of incapacity, or of an unwillingness to try?

The Burden Is on the Driver to Document It

This is the part people underestimate. An officer isn't required to diagnose a medical condition on the roadside or take a driver's word for it — the practical burden of establishing a genuine medical limitation falls on the driver, typically through medical records, a treating physician's statement, or other documentation connecting the claimed condition to an inability to perform the test. A bare assertion made after the fact, with nothing behind it, is a much weaker position than a documented, pre-existing diagnosis paired with contemporaneous evidence that the condition was actually in play that night.

Timing and Credibility: Why Mentioning It at the Scene Matters

A condition raised to the officer in the moment — and ideally captured on bodycam or noted in the police report — carries far more weight than one raised for the first time after a refusal charge is already filed. That doesn't mean silence at the scene automatically defeats the defense later; people in a stressful, escalating situation don't always think to explain a medical history to a police officer. But it does mean the timing of when a condition was first raised, and how it lines up with the video and the report, becomes part of what makes the claim credible or not.

When "I Was Too Intoxicated to Blow Right" Isn't the Same Defense

It's worth being direct about a limit here: difficulty completing the test because of the intoxication the state is trying to prove is not the same thing as a pre-existing medical condition, and courts don't treat it the same way. The defense described on this page is about a condition that exists independent of the alcohol or drug allegation — something that would have made a breath sample difficult or impossible on a sober day too. Conflating the two weakens the argument rather than strengthening it, and an officer's report that documents repeated coaching and genuine attempts, rather than a flat refusal to try, matters more than after-the-fact characterization either way.

Beating a Refusal Charge Doesn't End the DWI Case

This is worth being clear-eyed about. Refusal and DWI are two separate charges. Even without a completed breath test, New Jersey's DWI statute allows a conviction based purely on observed impairment — see our page on getting a DWI with no BAC reading or one under 0.08% for how that "under the influence" prong works. Successfully establishing medical inability removes the refusal charge's separate penalty, which matters, but the state can still pursue the underlying DWI using field sobriety performance, the driving pattern that led to the stop, and the officer's observations. See our pages on field sobriety tests in New Jersey and dashcam and video evidence in NJ DWI cases for how that side of a case typically gets built and challenged.

What Actually Helps Build This Defense

• Medical records showing the condition existed before the arrest, not just a diagnosis obtained afterward.
• Anything in the police report, dashcam, or bodycam footage showing repeated genuine attempts rather than a flat refusal.
• A treating physician's statement connecting the specific condition to an inability to sustain the breath volume the Alcotest requires.
• A consistent account — from the scene forward — rather than a condition mentioned for the first time in court.