Massachusetts Field Sobriety and Breath Test FAQs

No. The roadside tests are voluntary, declining them carries no license suspension, and the refusal cannot be mentioned at trial. Commonwealth v. McGrail, 419 Mass. 774 (1995), holds that field sobriety refusal evidence violates the privilege against self-incrimination under article 12 of the Massachusetts Declaration of Rights.

No. G.L. c. 90, § 24(1)(e) bars refusal evidence in the criminal case, and the Supreme Judicial Court reached the same result under article 12 in Opinion of the Justices, 412 Mass. 1201 (1992). The refusal still triggers a Registry suspension, which is explained on our breathalyzer and license suspension page.

A driver who hesitates and then takes the test produces a result the Commonwealth can use if the regulations were followed, while the hesitation itself stays out of evidence. Once a refusal is recorded, the police are not required to offer the test again, and the Registry suspension follows the refusal. The trial rule stays constant in both directions: valid results come in, and refusals never do.

They are standardized exercises, not scientific measurements. NHTSA validated the three-test battery to estimate blood alcohol level rather than driving impairment, with single-test accuracy of 65 to 77 percent in the original research, and the agency’s manual warns that any change to the standardized protocol compromises validity. Massachusetts courts treat performance as lay observation evidence. The full analysis is on our page on field sobriety and breath test defense.

The horizontal gaze nystagmus test asks the eyes to follow a stimulus while the officer watches for involuntary jerking. Under Commonwealth v. Sands, 424 Mass. 184 (1997), the result is inadmissible without expert testimony establishing its scientific reliability, and prosecutors rarely offer that foundation in district court.

In an alcohol case the officer may describe performance and may offer a lay opinion about sobriety or intoxication, but under Commonwealth v. Canty, 466 Mass. 535 (2013), no witness may opine on the ultimate question of whether the driver operated under the influence. In a marijuana case, Commonwealth v. Gerhardt, 477 Mass. 775 (2017), requires the neutral term roadside assessments and bars pass or fail testimony entirely.

G.L. c. 90, § 24K and 501 CMR 2.00 require a certified operator, an annually certified device, a 15-minute observation period immediately before the test, and a complete sequence of two adequate breath samples agreeing within 0.02 with a calibration standard analysis reading between 0.074 and 0.086. Missing paperwork or a broken sequence supports a motion to exclude the result.

The Office of Alcohol Testing withheld hundreds of failed calibration worksheets from defendants, and the courts responded in the Ananias litigation and in Commonwealth v. Hallinan, 491 Mass. 730 (2023). Breath test results from Alcotest 9510 devices between June 1, 2011 and April 18, 2019 are presumptively excluded, and drivers who pleaded guilty in cases with those tests may move to withdraw their pleas.

Yes. Commonwealth v. Camblin, 471 Mass. 639 (2015), entitles a defendant to a reliability hearing on the machine’s methodology, and the Supreme Judicial Court upheld the technology in 2017 only after that scrutiny. The compliance challenges under 501 CMR 2.00 remain available in every case.

Fatigue, nerves, age, weight, injuries, inner ear conditions, footwear, cold, uneven pavement, and the strobe lights of a traffic stop all degrade balance and coordination in sober people. The NHTSA manual itself lists categories of drivers the tests were not designed for, and no officer has a baseline for how a particular driver performs the exercises sober.

It is the tendency to treat everything after an early conclusion as proof of that conclusion. An officer who suspects impairment at the window often scores every stumble as a clue while recording none of what the driver did well, and cross-examination exposes the pattern by walking through what was never written down.

NHTSA’s research flagged drivers over 65, drivers with back, leg, or inner ear problems, and drivers more than 50 pounds overweight as poor candidates for the walk and turn and the one leg stand, and the protocol requires a dry, hard, level surface. Performance under the wrong conditions says little about alcohol.

No. Refusal evidence is barred by statute and by article 12, the prosecutor cannot comment on it, and the jury receives no explanation for the absence of test evidence. The case then turns on driving observations and the officer’s opinion, which is where cross-examination does its work. Our page on cross-examination in Massachusetts criminal trials explains the method.

The evidence is tested piece by piece: the stop, the exit order, the administration of the roadside exercises, the observation period, the machine’s certification records, and the officer’s opinion at trial. Attorney Serpa handles the criminal case and advises on the Registry consequences that run beside it. Call 617.936.0201 for a free, confidential consultation.