An OUI charge can threaten your driver’s license, employment, insurance rates, and freedom. Winn Law, P.C. represents clients charged with operating under the influence of alcohol or drugs throughout Massachusetts. Attorney Patrick M. Winn has handled thousands of OUI and drunk driving cases as both a prosecutor and defense attorney.

OUI & DUI Defense in Massachusetts

Massachusetts prosecutes operating under the influence aggressively. An OUI investigation may involve observations of your driving, statements made during the motor vehicle stop, field sobriety tests, observations of your appearance and behavior, and breath, blood, or other chemical testing.

But evidence of alcohol  consumption is not the same thing as proof of impairment. The Commonwealth must prove the elements of OUI beyond a reasonable doubt, and the strength of its case depends heavily on what actually happened before, during, and after the motor vehicle stop.

Every OUI case should therefore be examined individually. Small details can make a significant difference.

Challenging the Motor Vehicle Stop and Police Investigation

An OUI defense begins with the circumstances that brought the police into contact with the driver.

Police generally need a lawful basis to stop a vehicle. Depending on the circumstances, evidence may be suppressed when an officer conducts an unlawful motor vehicle stop or search.

Statements attributed to the driver also deserve careful scrutiny. Police routinely ask drivers questions during OUI investigations, including questions about where they were coming from, whether they consumed alcohol, how much they drank, and when they had their last drink. Depending on when and how the questioning occurred, statements obtained during a custodial interrogation may be subject to suppression if police failed to provide required Miranda Warnings.

The police report should be compared carefully against available video, dispatch information, witness accounts, and other evidence. What an officer describes in a report does not necessarily establish what the Commonwealth can ultimately prove in court.

Field Sobriety Tests

Police frequently rely on field sobriety tests as evidence that a driver was impaired. These tests should not simply be accepted at face value.

The circumstances under which the tests were performed matter. Road and weather conditions, footwear, physical limitations, the officer’s instructions and demonstration, and the manner in which the officer evaluated the performance may all affect the significance of the results.

Massachusetts law also places limitations on how certain roadside testing can be used at trial. For example, the Horizontal Gaze Nystagmus test frequently administered during OUI investigations presents evidentiary issues that differ from the traditional walk-and-turn and one-leg-stand tests.

Breath Test Evidence

A breath test result can appear to be powerful evidence, but it does not automatically establish guilt. Before the Commonwealth can use a breath test result at trial, it must establish that the evidence is legally admissible.

Massachusetts regulates breath testing through the Code of Massachusetts Regulations (CMRs). Those regulations establish requirements governing the administration of breath tests and the procedures that must be followed to obtain a valid result. A failure to comply with applicable regulatory requirements can provide a basis to challenge the admissibility of breath-test evidence and, where appropriate, seek to suppress or exclude the result.

When a breath test is involved, the defense should therefore examine more than the number printed on the test result. The testing procedure, operator records, machine and certification records, applicable CMR requirements, and other evidence bearing on admissibility and reliability should all be reviewed carefully.

A breathalyzer reading may look scientific and conclusive. Whether the jury is ever permitted to hear that number is a separate question.

Breath Test Refusals

A driver who refuses a breath test may face significant driver’s-license consequences. Those administrative consequences, however, are different from what the Commonwealth may introduce as evidence at the criminal OUI trial.

The distinction matters. A person should not assume that refusing a breath test proves—or can simply be used to argue—that the person was driving under the influence.

Experience Defending Massachusetts OUI Cases

Attorney Patrick M. Winn has extensive experience handling OUI cases from both sides of the courtroom. As a former Assistant District Attorney, he understands how prosecutors investigate, evaluate, and prepare drunk driving cases. As a criminal defense attorney, he has handled thousands of OUI and drunk driving matters and has successfully represented clients facing the possibility of conviction, fines, probation, and lengthy periods of license loss.

That experience does not mean every OUI case has the same defense. It means knowing where to look for the weaknesses in each individual case.

The reason for the motor vehicle stop, the officer’s observations, body-worn or cruiser video, statements attributed to the driver, field sobriety testing, chemical-test evidence, and the Commonwealth’s ability to prove impairment beyond a reasonable doubt should all be examined before deciding how an OUI case should be defended.

Winn Law is a solo criminal defense practice. Clients work directly with Attorney Winn in evaluating the evidence, preparing the defense, and litigating the case.

For a free and confidential consultation about an OUI or DUI charge in Massachusetts, contact Winn Law, P.C.