Chief of emergency medicine Dr. Melisa Lai Becker in one of the resuscitation rooms in the emergency ward at Cambridge Health Associates Hospital in Everett, Mass. In the past 10 years, Lai-Becker says, she hardly saw any stimulant overdoses. These days, there are about four a week.

Chief of emergency medicine Dr. Melisa Lai Becker in one of the resuscitation rooms in the emergency ward at Cambridge Health Associates Hospital in Everett, Mass. In the past 10 years, Lai-Becker says, she hardly saw any stimulant overdoses. These days, there are about four a week.