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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.
So after 9, 12 ounce beers at 5% alcohol (real beer like Canadian) would require this individual to wait at least 9 hours but probably a bit more before testing negative for a standard urine U/A or a breathalyzer test. Women metabolize ethanol more slowly as do people that weigh less than 170 lbs.