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Who Poisoned Viktor Yushchenko?

Investigators are trying to determine who poisoned Ukrainian presidential candidate Viktor Yushchenko with a potent dose of a chemical called dioxin. NPR's Alex Chadwick talks with John Trestrail, a toxicologist who has served as an expert in many criminal poisoning investigations.

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Alex Chadwick
For more than 30 years, Alex Chadwick has been bringing the world to NPR listeners as an NPR News producer, program host and currently senior correspondent. He's reported from every continent except Antarctica.