Dallas Police Association President Mike Mata and others sounded the alarm months ago: Now, by the end of this month, Mata says 72 Dallas Police officers will leave: 70 percent of them are retiring and the other 30 percent are going to make more money at other departments. “We’re losing some of our most experienced detectives: The investigator you want to come out and solve that homicide, that you need to come out and solve that sexual assault.”