Without a warrant, you are not required to give the officer the time of day, let alone allow him to explain the reasons for being at your door or heaven forbid, permit the officer to enter your home. If the officer does not have a warrant, don’t slam the door, be abusive or yell. JUST SHUT THE DOOR.
Did you know if a police officer comes to your door, the first thing you should do is ask to see his warrant?