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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: While they are not as accurate as blood tests, Breathalyzers have been considered acceptably accurate by most courts as tools for gathering evidence. However, some independent studies have determined that breath readings can vary by 15 percent from actual BAC levels (as measured by a blood draw).