Today, security is an expression that is very sensitively used in all areas of our lives. Security measures, security risks, security cameras, etc. ensuring the security of loved ones, staff, the city’s population, animals and objects is a priority for most of us. It is not easy task and, unfortunately, is not something that can be  resolved forever. We will always have to resolve it again and again, because new security risks will always arise. The most frequent source of fear is the risk of entry by undesirable people (or animals) into buildings and onto land. An analogical problem is the search for missing persons in particular areas. Searching from missing persons in an open area during the day is not usually problematic although conditions are not always ideal — fog may appear or the area may be intentionally smoked out. The cycle of the time and day play against us and intruders usually operate under the cover of darkness.