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鈥� physical and mental health.聽 Spurred by operators鈥� concerns, five transit agencies in Washington and Oregon approached researchers at the 天美影视传媒 with a yes-or-no question: Were transit operators being exposed to drug…
