Phoenix, AZ —Usually when police fail to respond to radio or MDT transmissions it’s usually the failure of equipment that’s responsible. Officers are trained to check their radios if there are prolonged periods of silence perhaps due to a dead battery. The South Mountain precinct is usually a busy assignment for any cop. There are trailer parks, loads of very modest homes and often they include various farm animals and chickens. There is the South area of the state capital campus that’s patrolled by the Capital Police Department . At night this area is desolate and void of all but a few homeless types that can be found sleeping there. The Capitol police have their own radio frequencies and generally are not alerted about nearby matters handled by Phoenix police. Sergeant Sean Drenth of the South Mountain Precinct was missing and incommunicado. Fellow officers along with the helicopter unit began a search just after 10 PM last night. An hour later a Capitol police civilian security...