Some private companies that screen airline passengers are charging more for their services now that the government is footing the bill, says a federal report that found one company nearly doubled its rates. The Transportation Department's inspector general also found cases where the companies billed the government for absent employees and work that was never completed. And it found lax oversight by government officials. Before Sept. 11, private companies had contracts with airlines to screen passengers and their carry-on bags. After the terrorist attacks, Congress created the Transportation Security Administration, which was ordered to take over the contracts, worth $1.6...