For those who hadn't made the decision already, this is why you should be answering the door with your gun in your hand (or at least on your person).
Source: Police: Fake census worker invades home, kills owner | khou.com | khou.com Local News (9 May 2010)
HOUSTON -- Police are warning homeowners to be careful who they allow inside their homes. A man posing as a census worker and two more suspects barged into a north Houston house Saturday afternoon, killing the homeowner and beating others. It happened Saturday afternoon...
Source: Police: Fake census worker invades home, kills owner | khou.com | khou.com Local News (9 May 2010)