CONCORD — A legal challenge that could have far-reaching effects for drunk driving cases in Massachusetts opened with an early blow to state prosecutors.After more than a year of preparation, Judge Robert A. Brennan on Tuesday opened a hearing on the scientific reliability of the Alcotest 9510, the instrument used by state troopers and local police to measure the blood-alcohol content of drunk drivers.While he previously signaled he would limit the scope of the [...]
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