The Federal Emergency Management Agency manipulated scientific research to play down the danger posed by formaldehyde in trailers issued to hurricane victims, according to an investigation by congressional Democrats. FEMA "ignored, hid and manipulated government research on the potential impact of long-term exposure to formaldehyde" on Katrina and Rita victims now living in FEMA trailers, said a letter written by Democrats on Monday. Democrats on a House Science and Technology subcommittee wrote the letter to Homeland Security Secretary Michael Chertoff. FEMA is part of the Homeland Security Department. In a separate letter, lawmakers said the federal health agency that provided guidance to FEMA was "complicit in giving FEMA precisely what they wanted."

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