Having only recently moved to Tustin with her three children, Gena Zarza had never seen the kind of Christmas spirit bestowed by the Tustin Police Department that she experienced during the Santa Cop festivities. Zarza, along with her 2- and 3-year-old daughters and 10-year-old son, were among 80 specially selected families treated to an evening of holiday-themed activities, highlighted by face time with Santa himself during the 30th annual event, designed to brighten the holidays for under-served families. The kids received gifts and dinner, played games, and had their faces painted Dec. 11 at the Clifton C. Miller Community Center…