NEW YORK — New York Police Department First Deputy Commissioner Benjamin B. Tucker knows that what an officer sees on the job can have an impact for many years.... He still remembers the deadly gang-related arson when he was a beat cop in Brooklyn in the 1970s, and the unsolved murder of a man he found lying on the pavement, the bullet wound behind his ear not yet visible. Support our journalism.... 6, four police therapy dogs from two Northern Virginia departments — Fairfax County and Arlingt