(ABC NEWS) — Environmental activist Erin Brockovich has launched her own investigation into the mysterious illness causing facial tics and verbal outbursts among 15 teenagers in Le Roy, N.Y.

Most of the teens have been diagnosed with conversion disorder — a psychological condition that causes physical symptoms like jerky tics, convulsions and even paralysis. But Brockovich suspects groundwater contamination from a chemical spill from more than 40 years ago may be behind the Tourette-like symptoms.

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