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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.
Introduction to How Breathalyzers Work. We hear and read about drivers involved in an accident who are later charged with drunken driving, and usually a news report on the accident will say what the driver's blood alcohol level was and what the legal limit for blood alcohol is.ou have probably heard about the Breathalyzer, but may wonder exactly how a person's breath can show how much that person has had to drink. Â­It is important for public safety that drunken drivers be taken off the roads. Of the 42,000 traffic deaths in the United States in 1999, about 38 percent were related to alcohol.