After two attacks by a man posing as police in Minnesota, Americans are wondering if they have to open the door to someone ...

Discover WITNESS: Access our exclusive collection of true crime stories, podcasts, videos and more. Police are knocking and want you to open the door. If an officer is knocking on your door, the ...

After two attacks by a man posing as police in Minnesota, Americans are wondering if they have to open the door to someone ...