Officers received a report that a man was talking to himself and cursing loudly aboard a San Francisco train. The officers located the suspect based upon his description and initiated a welfare check. While talking to the officers, the man pulled a BART ticket out of his pocket. In the process, several pieces of suspected rock cocaine fell out of his pocket and onto the ground. A search of the suspect revealed methadone and drug paraphernalia. The suspect was arrested for possession of the controlled substances and for possession of drug paraphernalia. A sergeant approved the arrest and debriefed the suspect. The suspect was booked into Santa Rita Jail.