The San Diego Police Department dates to 1889, when out-of-control crime forced the end of the highly ineffective city marshal's office. With violence on every corner and Tombstone's venerable Wyatt Earp running the marshals' gambling interests, change was desperately needed. But the first days of the SDPD weren't easy. Within two years of its formation, the city's economy tanked, 36,000 of the town's 40,000 citizens left, and the department's newly...