What Are Field Sobriety Tests (FSTs) in Massachusetts?
Field Sobriety Tests (FSTs) are a battery of divided-attention psychophysical roadside exercises administered by law enforcement officers to determine whether probable cause exists to arrest a driver for Operating Under the Influence (OUI) under M.G.L. c. 90, § 24.
If you are stopped by police in Quincy or anywhere in Norfolk County—such as along I-93 (Southeast Expressway), Route 3, Burgin Parkway, Hancock Street, or Southern Artery—the officer may request that you exit your vehicle to perform these tests.
Most drivers mistakenly believe these roadside tests are mandatory, objective, or scientific exams. In reality, Field Sobriety Tests are 100% voluntary under Massachusetts law, inherently subjective, and designed to generate evidence for the prosecution to use against you in court.
Where Are Quincy FST Challenges Litigated?
Whether an officer administered roadside tests correctly, whether environmental conditions invalidated the results, and whether test testimony can be excluded before trial is decided at:
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Courthouse Location: Quincy District Court, 1 Dennis F. Ryan Parkway, Quincy, MA 02169 (Serving Quincy, Braintree, Cohasset, Holbrook, Milton, Randolph, and Weymouth).
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Prosecuting Authority: Norfolk County District Attorney's Office (Motor Vehicle Unit).
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Evidentiary Proceedings: Pre-trial suppression hearings, Motions in Limine, and 6-person jury trials.
The 3 NHTSA Standardized Field Sobriety Tests (SFSTs)
The National Highway Traffic Safety Administration (NHTSA) has validated only three standardized tests for law enforcement use:
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Standardized Test |
How the Officer Administers It |
What "Clues" the Officer Scores Against You |
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1. The Walk-and-Turn (WAT) |
You are instructed to take 9 heel-to-toe steps along a real or imaginary straight line, turn using a series of small pivot steps, and take 9 heel-to-toe steps back. |
Officers look for 8 recognized clues (scoring 2 or more clues is labeled an "indication of impairment"): • Cannot keep balance during instructions • Starts before instructions finish • Stops walking to steady balance • Misses heel-to-toe contact (gap greater than 0.5 inches) • Steps off the line • Uses arms for balance (raised more than 6 inches) • Improper turn / pivot • Takes the wrong number of steps. |
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2. The One-Leg Stand (OLS) |
You must stand with feet together, raise one foot approximately 6 inches off the ground, keep your eyes on your foot, and count aloud ("one-one-thousand, two-one-thousand...") until told to stop (typically 30 seconds). |
Officers watch for 4 specific clues (scoring 2 or more clues is considered failing): • Swaying while balancing • Raising arms more than 6 inches for balance • Hopping to maintain balance • Putting the foot down before 30 seconds elapse. |
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3. Horizontal Gaze Nystagmus (HGN) |
The officer holds a stimulus (a pen or small penlight) 12 to 15 inches from your nose and moves it horizontally while observing your pupils for involuntary jerking (nystagmus). |
Officers check each eye for 3 specific indicators (6 total clues): • Lack of smooth pursuit • Distinct and sustained nystagmus at maximum deviation • Onset of nystagmus prior to a 45-degree angle. |
Massachusetts Law on HGN: Under Massachusetts Supreme Judicial Court precedent (Commonwealth v. Sands), HGN test results are strictly inadmissible at trial unless the Commonwealth presents qualified expert witness testimony establishing that the officer is scientifically trained to interpret neurological eye movement. Because patrol officers rarely possess this medical expertise, our attorneys routinely file motions to exclude HGN testimony entirely in Quincy District Court.
Non-Standardized Tests (Alphabet, Counting, Finger-to-Nose)
Officers frequently ask drivers to perform non-standardized tests, such as reciting the alphabet from "D to T," counting backwards from 68 to 53, or touching their finger to their nose.
These tests have zero scientific backing or validation from NHTSA. They are purely subjective tools designed to divide your attention while the officer listens for slurred speech or confusion.
Can You Refuse Field Sobriety Tests in Massachusetts?
YES. You can refuse roadside Field Sobriety Tests without any statutory license penalty.
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Implied Consent Does NOT Apply to FSTs: The Massachusetts Implied Consent Law (M.G.L. c. 90, § 24) applies only to chemical breath and blood tests at the police station—it does not apply to roadside physical coordination tests.
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The Jury Cannot Know You Refused: Under Article 12 of the Massachusetts Declaration of Rights, your refusal to perform roadside tests is 100% inadmissible at trial. The prosecutor is legally prohibited from telling a Quincy District Court jury that you declined the tests, and your refusal cannot be used as an admission of guilt.
How We Dismantle Field Sobriety Evidence in Quincy District Court
Even completely sober drivers regularly "fail" roadside coordination tests due to natural balance issues, intimidation, or poor testing environments. We challenge FST testimony by exposing:
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Environmental & Roadway Flaws: NHTSA guidelines mandate a reasonably dry, level, hard, non-slippery surface with adequate lighting. We use cruiser dash-cam and street data to prove testing on sloping highway shoulders (like the ramps of Route 3 or I-93), cracked asphalt, gravel, or in freezing rain invalidates the score.
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Medical & Physical Limitations: NHTSA's own studies establish that the Walk-and-Turn and One-Leg Stand tests are unreliable for individuals who are 50+ pounds overweight, 65 years of age or older, or who suffer from back, leg, inner ear, or knee issues.
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Footwear & Attire: High heels, dress shoes, heavy work boots, or loose sandals directly undermine physical stability on the roadside.
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Officer Administration Errors: If the officer deviated from the mandatory, standardized NHTSA script during the instruction phase, the test is legally compromised.
Contact Our Massachusetts OUI Defense Team Today
The Law Offices of Kensley Barrett
📍 Massachusetts Office: 572 Washington Street, Suite 21, Wellesley, MA 02482
📞 Call Now: (857) 229-2442
🌐 Website: www.krbarrettlaw.com
