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A field sobriety test is a series of tests performed by police officers to determine if an individual is driving with a blood alcohol content (BAC) of .08% or higher.

These tests were formulated by the National Highway Traffic Safety Administration to determine impairment. However, as the NHTSA will admit, the tests are not always reliable. Officers may administer the test incorrectly or the driver may perform poorly because of nerves, fatigue, and other factors. When the tests are administered, the officers only note what the driver did wrong, and not what he or she did right, and this can lead to false accusations of intoxication.

If you have undergone a field sobriety test and were arrested for drunk driving, it is crucial that you obtain the help of an experienced Boston criminal defense lawyer. By calling Jack Diamond Law Offices for a free consultation, we can help you understand the charges you face and the legal options you have available. If hired, we will do whatever we can to reduce the charges or have them dismissed altogether.

Let an experienced Boston DUI lawyer represent you in your DUI case. Call (617) 925-6772 for a free consultation. We also have offices in Plymouth, Hingham, and Quincy.

Are You Required to Stop For a DUI Checkpoint?

Yes, in the state of Massachusetts DUI checkpoints are constitutional (Commonwealth vs. Shields). You are required to stop and allow the police to detain you for a reasonable amount of time of interview you to determine if you are operating your vehicle while under the influence of drugs or alcohol.

Can You Refuse sobriety tests in massachusetts?

Yes, the state of Massachusetts gives drivers the option to refuse field sobriety tests. We suggest that you decline if asked to participate. The evidence from these tests will only be used against you. Most officers will document any mistakes you make without noting tests you performed correctly.


In Massachusetts, field sobriety tests are particularly important. Due to a law passed in July 2003, drivers can be proven guilty of a DUI if their right to operate a vehicle was impaired by the amount of alcohol that they consumed, or if their BAC was at or above 0.08%.

Field sobriety tests may play largely into the prosecution’s evidence against the defendant.

What are different Types of Sobriety Tests?

Officers may ask you to perform all of the field sobriety tests while you are detained, or only or two one of them.

The three NHTSA-validated tests are as follows:

  • Horizontal gaze nystagmus: Demonstrates smooth eye movement or lack thereof to determine intoxication. Officers will use objects for the person’s eyes to track while the officer observes the person’s ability to see clearly
  • Nine step walk and turn: Used to show how well a person is able to balance, as a lack of balance could be grounds for arrest for OUI
  • One leg stand test: Person must hold a position while standing on one leg without swaying, using their arms to balance, or hopping

Defenses for Field Sobriety Tests

While there are other tests that may be used by law enforcement, these three are the only ones that are validated. Other tests should not be considered as evidence of inebriation. All tests must be administered on a non-slippery, hard, and dry surface in a well-lit area. Police must keep in mind that a person with neck, back, or mobility problems will have difficulty completing the tests. Also, drivers with ADD, ADHD, or another mental illness may struggle to perform the tests even when sober.

Protect yourself by avoiding field sobriety tests and speaking with a lawyer as soon as possible. Our aggressive Boston OUI attorney, Jack Diamond, is a former prosecutor fighting relentlessly for his clients.

Arrested for a DUI? There is hope. Call (617) 925-6772 or contact us online right now to get started.