[Slyfox]

"From a (chemical) fingerprint, at least you can deduce what kind of sources might have been involved," Prof Brouwer said. "The labs will ... try to find out whether it matches any of the batches of dioxins that are around, so that maybe you can trace it back to where it was ordered or where it came from."

Mr Yushchenko....first fell ill after having dinner with Ukrainian Security Service chief Ihor Smeshko and his deputy Volodymyr Satsyuk on September 5. He reported having a headache about three hours after the dinner, and by the next day had developed an acute stomach ache.

It's sort of a no-brainer ain't it?

[eno_]

Mr Yushchenko....first fell ill after having dinner with Ukrainian Security Service chief Ihor Smeshko and his deputy Volodymyr Satsyuk on September 5. He reported having a headache about three hours after the dinner, and by the next day had developed an acute stomach ache.

Yeah, I'd say that would about do it. I bet one would find a pattern of such poisonings over the course of these guys' careers. Easy to cover up when everyone must be loyal to Party and State.