HOUSTON --Customs has now started screening passengers from Japan for radiation exposure. The move is called a precautionary one given the nuclear crisis there. A Dallas report indicated some disembarking passengers at DFW airport showed signs of exposure. Most experts don't expect any levels detected so far to pose danger to themselves or others. Today at Bush Intercontinental airport, passengers who landed at 1:45pm were scanned. We're told anyone showing radiation exposure would be advised to check with their doctor if the levels are higher than expected. Passengers last underwent screening during the SARS flu outbreak two years ago.