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Two years ago, as life regained its rhythm and public transit once again filled with people, train and bus operators spotted a troubling trend. Some operators reported instances of people smoking drugs on their vehicles, and worried that the haze it created could linger, potentially affecting workers’ physical and mental health.  Spurred by operators’ concerns, five transit agencies in Washington and Oregon approached researchers at the University of Washington with a yes-or-no question: Were transit operators being exposed to drug…