Some people with cognitive impairment are left alone in their homes, wandering aimlessly around the house. Whenever an elder walks up to the front door without being stopped by others, there is a possibility that he or she may open the door and leave the house on his or her own. Signs or phrases such as “If you have to go out, please call your family” or “Please stay at home” can be posted at the front door as a line of defense to remind elders to stay at home as much as possible instead of going out on their own, which can help reduce the risk of getting lost.