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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.
1 Amount. 2  The amount of alcohol is the most obvious factor, as well as the most important. 3  How quickly you consume. 4  Four drinks within one hour, for example, will yield a higher Blood Alcohol Content than four drinks within three hours. 5  Body mass.our Blood Alcohol Content (BAC)âalso known as Blood Alcohol Levelâis what breathalyzers are designer to test for. The legal BAC level for operation of motorized vehicles in most states is 0.08 for those over the legal drinking age, but can vary from state to state.