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In Massachusetts, the legal limit for alcohol is .08 Blood Alcohol Content (BAC) for those over 21, and .02 for those under 21 (aka zero tolerance). You are generally better off not taking the breathalyzer if asked to do so by the police. The fact that you refuse the breath test/breathalyzer test cannot be noted or used against you in court.
A breathalyzer is a device that is used to estimate your (BAC) from a breath sample. Breathalyzers can detect and measure your current alcohol levels. You blow into a breathalyzer and the results are given as a number. This is known as the Blood Alcohol Concentration (BAC). This shows the level of alcohol in your blood at the time the test is taken. (Check out our BAC Calculator for a demonstration of how BAC works.)