Remember, you are under no duty to open your door just because someone knocks. Look first. A peephole is a necessity. An intercom is a good addition. NEVER open your door until you have verified who is on the other side. Once the door is open, they’re in. If someone claims there has been an accident or other emergency, tell them you will call the police for them. There is no need for them to come inside and make the call. This tip is from the December 15 Rangemaster newsletter.