In this module, security patrols are presented as a key component to preventing and deterring loss. Observation is a critical element on every patrol that a security officer conducts during his or her shift. The importance of varying the route and time of patrol is emphasized, and the role that security patrols play in fire and theft prevention, and monitoring for potential safety hazards on the client’s premises is discussed. The different types of patrols are presented such as those conducted on foot, in a vehicle, and on a bike. The differences and purpose of high-visibility and low-visibility patrols are compared as well as how our senses are an important tool to rely on.