Is Toxic Waste to Blame for Mysterious Illness?

Teenagers in upstate New York suddenly came down with Tourette's like symptoms.
4:56 | 01/30/12

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Transcript for Is Toxic Waste to Blame for Mysterious Illness?
Officials in upstate New -- are trying to figure out why a group of teenagers most of them girls suddenly came down with symptoms resembling to -- syndrome. Doctors believe the psychological problem -- -- contagious hysteria but Erin Brockovich thinks toxic waste may beautifully. After Japan's I think by with his expert Tate and ABC's -- gave -- start this off. For seventeen year old Lydia Parker. Came just putting on makeup is a painful reminder of the physical tics verbal outburst. Even fainting spells which -- played her since this fall. I can't stand for more than about two minutes -- -- in a wheelchair. And my vocal. And take everything everything gets really bad at night. Parker is won -- fifteen students at LeRoy high school in upstate New York suffering from this strange tourette's syndrome like symptoms. A medical mystery some believe may be caused by chemical contaminants under her school. Now Erin Brockovich is investigating. Over the weekend representatives working with Brockovich work kicked off the LeRoy campus after trying to collect water samples -- -- The school called the testing grandstanding. But Brockovich believes in 1970 train derailment three miles away from the school. May have leaked 35000. Gallons of toxic chemicals into the ground and water. We owe it to that community and these people. To find out if in fact this is underneath that school. New York's Health Department found quote no evidence of environmental or infection as the cause of the girl's illness. And doctors believe they suffer from something called conversion disorder that stress not contamination. Is causing the ticks. That's little solace for Parker what most frustrates you. That I don't have any answers for Good Morning America Lindsey Davis ABC news New York.

This transcript has been automatically generated and may not be 100% accurate.

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