article_snippet.sent: Maybe there was some kind of polonium leak and some kind of polonium leak was gradually accumulating in Kovtun testifies body. '
article_snippet.sent: I don't know if Kovtun testifies had some kind of polonium leak with Kovtun testifies or if somebody gave Kovtun testifies something that Kovtun testifies carried with Kovtun testifies.
article_snippet.sent: Where Kovtun testifies got some kind of polonium leak from, that is the question.'
article_snippet.sent: Polonium is exceptionally rare, and experts have previously said that the amount ingested by the victim could only have been produced in a government-run facility.