By Armen Keteyian, Laura Strickler and Michael Rey
On tonight's Evening News, we reported another startling development: FEMA knew a year ago about the high levels of formaldehyde in the trailers used by victims of Hurricanes Katrina and Rita.
How do we know? CBS News obtained this internal FEMA document produced by FEMA's own employee safety department. They tested 28 trailers and found at least 20 had levels of formaldehyde higher than the EPA's recommended workplace limit.
We also got this letter that Senator Mary Landrieu, D-La., sent to FEMA Director David Paulison.
The Senator's letter takes Director Paulison and FEMA to task for a many of the same issue's we've reported on the Evening News.
Click here to read more of our reports on FEMA and formaldehyde.