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Here is the MSDS for trichloroethylene.
There has not been adequate testing at the school It is way too soon to make any judgements as to the cause of the illness. Erin Brockovich, known for her legal research on a huge California water contamination case many years ago, has said,
While we don't have the answers, we are suspicious that the all-clear has been sounded on the environmental side, and we don't believe that it should have been.A long time ago Ms. Brockovich uncovered the fact that Pacific Gas and Electric had been poisoning the water of Hinkley for over 30 years. Her story was made into a movie starring Julia Roberts.
Here is a must read article about Erin Brockovich's investigation of the rare illness in LeRoy, New York. She already has a prime suspect.