For many Americans, only an explicit disavowal of his past support for such theories would signal that he is a decent man worth dealing with.

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The government offered two theories in support of the law.

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And a recent poll conducted by The Kansas City Star shows a lot of support in Kansas for alternate theories.

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There is no shortage of theories: still lacking is detailed research to support or explode them.

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She said while the suggestions Mr Litvinenko may have committed suicide or died in an accident were "distasteful" to his widow, and there was "not a shred of evidence" to support them, Mrs Litvinenko was prepared to see the theories examined at the inquest.

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