By the end of a recent shift, Deer Park Police Department dispatcher Brandi Brumley had updated training manuals, comforted callers, monitored the safety of the city's police, fire and EMS personnel and mentally run through hundreds of potential scenarios that might arise with the next ring of the phone. During the recent shift of another department dispatcher, Jarrett Grundman, steeled himself to answer calls that range from run-of-the-mill to emergencies such as drownings, heart attack...