Dr. Melisa Lai-Becker, chief of emergency medicine, stands in one of the resuscitation rooms in the emergency ward at CHA Everett Hospital, near Boston. In the past 10 years, Lai-Becker says, she hardly saw any stimulant overdoses. These days, there are about four a week.

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Dr. Melisa Lai-Becker, chief of emergency medicine, stands  in one of the resuscitation rooms in the emergency ward at CHA Everett Hospital, near Boston. In the past 10 years, Lai-Becker says, she hardly saw any stimulant overdoses. These days, there are about four a wee