A DWI case usually begins with a traffic stop, a roadside investigation, an arrest, and then a chemical test of your breath, blood, or urine at the precinct. Each step has rules the police must follow, and each is a place where a case can be challenged. Here is how it works and where the pressure points are.
The stop and the arrest need a lawful basis
Police cannot pull you over on a hunch. A stop requires reasonable suspicion supported by specific, articulable facts; an arrest for DWI then requires probable cause, evidence that the crime of drunk driving occurred. If the stop or the arrest was not properly justified, we can request a suppression hearing, where the arresting officer is cross-examined and the judge decides whether probable cause existed. Even when a judge sides with the prosecution, these hearings routinely expose problems that lead the District Attorney to reduce the charge or work toward a resolution.
The roadside test vs. the evidential chemical test
The small handheld device used at the roadside (a preliminary breath test) is a screening tool, treated very differently from the evidential chemical test given at the precinct on a larger, calibrated instrument. That evidential machine is only reliable if it was properly maintained and calibrated, operated correctly, and used after the required observation period. As our DWI FAQ details, mouth alcohol, GERD/heartburn, certain diets, radio-frequency interference, individual blood-to-breath ratios, and a still-rising blood-alcohol level can all distort a reading, the reasons a single number is far from the whole story.
Implied consent, and what refusing really costs
Under New York's implied-consent law, driving on the State's roads is treated as consent to a chemical test when you are lawfully arrested for DWI. You can still physically refuse, but refusal carries its own penalty, separate from the criminal case: an automatic license revocation of at least one year (18 months for a commercial driver), a $500 civil penalty ($750 for a repeat refusal), and the $250-per-year Driver Responsibility Assessment for three years. These apply whether or not you are ever convicted of the DWI, and a refusal can be mentioned by the prosecution at trial. Whether refusing helped or hurt depends entirely on the facts, one more reason to get advice quickly.
The DMV refusal hearing
A refusal triggers a separate DMV administrative hearing before an administrative law judge, generally scheduled within about 15 days. At it, the officer must establish four things: reasonable grounds to believe you were driving while impaired or intoxicated, a lawful arrest, that you were clearly warned of the consequences of refusing, and that you in fact refused. If the officer cannot prove each element, or does not appear, your driving privileges can be restored. Jonathan has handled hundreds of these hearings, and they are a genuine opportunity, not a formality.