According to Libertarian Republican:
"Big Brother's reach now extending right into our Homes
No imagination is required to think up a whole laundry list of evil that could be done with a nationwide GPS grid of coordinate’s markers painted on every private home across the country. But I was having trouble thinking up one good reason for it, even one legitimate use that would justify what must be a very expensive undertaking.
According to one of the Census workers, who spoke with me on condition of anonymity, they must GPS mark the coordinates “within 40 ft of every front door” in America and they are supposed to complete that mission nation wide, within 90 days, by the end of July 2009.
The workers were not told why they were GPS marking every front door. But a supervisor is sent out to follow them door-to-door, to make certain that no door is left unmarked. Every door will be marked by one employee, and then checked by a follow-up supervisor.
However, since the actual Census is not due to be taken until 2010, nobody is asking for any information today. They are only GPS marking your front door today, and Sec. 223, Title 13, U.S. Code, Chapter 7, Subtitle 2 provides the Fed NO authority to GPS paint your front door.
Best I can tell, the Fed has NO authority whatsoever, to paint the front door of every private residence in America. Still, that is exactly what they are doing. Now, the trillion dollar question is, why?"