BART police Officer Tom Smith and his K-9 Boriswalk through a BART train in between the Milbrae and SFO BART stations in Milbrae, Calif. on  July 7, 2005.
BART police Officer Tom Smith and his K-9 Boriswalk through a BART train in between the Milbrae and SFO BART stations in Milbrae, Calif. on July 7, 2005. (Dean Coppola/Bay Area News Group Archives) (DEAN COPPOLA)