Image by Images: CensusImage by 20090404-worker.jpg Census workers will have these PDA devices, and cary identifying cards (below).

Workers from the U.S. Census Bureau are scheduled to begin knocking on South Carolina doors come Monday, April 6, and continue doing so for several months.

All workers will wear an identifying red, white, and blue badge with their name, and they will never ask for credit cards, checks, or any other form of money.

Here's loads more information about the "canvasing program" straight from the Census Bureau.