Researchers Back Dioxin Poisoning of Yushchenko Dutch researchers have confirmed that Ukrainian opposition leader Viktor Yushchenko was poisoned by TCDD, the most harmful known form of dioxin. NPR's Jon Hamilton reports.

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Researchers Back Dioxin Poisoning of Yushchenko

December 17, 200412:00 AM ET

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Jon Hamilton

Researchers Back Dioxin Poisoning of Yushchenko

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Dutch researchers have confirmed that Ukrainian opposition leader Viktor Yushchenko was poisoned by TCDD, the most harmful known form of dioxin. NPR's Jon Hamilton reports.