A male juvenile approached the station agent and told him that he had injested methamphetamine. Officers responded and located the juvenile on the platform. Medical attention was requested. The juvenile was determined to be missing from a group home in Santa Rosa that specializes in youth with substance abuse problems. Officers located suspected methamphetamine on the juvenile's person. After being medically cleared at San Leandro Hospital, the juvenile was booked at the Alameda County Juvenile Hall for possession of narcotics.