Thugs posing as FBI ransacked a house in Georgia after pistol whipping the homeowner. It does sound like they may have kicked in the door, but all too often people willingly open their door for anyone with a shiny thing on their chest.
Always ask for a warrant, and make sure it's signed by a judge before you allow entry.
Of note, the victim's neighbor responded to the four armed intruders with a gun in his hand, and instead of a "Wild West" shootout, the scumbags instead decided that the stakes were too high and left the area in a big hurry. Who would have thought that one armed good guy would deter four armed bad guys? Weird.