Radio traffic and dispatched calls can forewarn of hazardous situations. In such situations, police officers should be aware of the environment so that good cover items are identified, watch the hands of subjects, place subjects at a tactical disadvantage, arrive at a call prior to the cover unit, and take a safe position while waiting for the cover unit's arrival. In addition, police officers should know the location and distance of the cover unit and consider the impact of traffic conditions, environment, and other circumstances that affect driving time. Communication is a critical ingredient in the successful employment of contact and cover. Police officers should be aware of potential danger signals at all times in the course of their patrol duties and should not be deceived by compliance or friendliness on the part of suspects. 4 photographs