Ahmad Yaseen Arain, the UCLA honors student who vanished from an MTA bus in the Fairfax area in July, turned up in Tijuana. His relatives say that he drank from gas station hoses and squeaked out an existence for a month there after a mental breakdown. A Mexican family found him beside a road two weeks and took him in. He emailed his family in Orange Sunday and they picked him up. If they know how he got to Tijuana, nobody is saying yet. LAT DN

