Although drunk driving remains the No. 1 cause of highway deaths, drugged driving is an emerging and growing threat we cannot ignore. My 16-year-old daughter, Helen Marie, was killed by a teen driver impaired by both alcohol and marijuana – an especially dangerous combination. Impairment is impairment, and MADD is working to support victims of these crimes and fight for policies and technologies to make sure there are no more stories like Helen Marie’s.