Original sentence: But it also fits much more comfortably into another scenario: that of nuclear smuggling.For a start, it is extremely expensive.It seems far more likely that the polonium tracked in London was part of some sort of deal – a deal that, for whatever reason, went disastrously wrong.Journalist Mary Dejevsky also wrote in The Independent that the "by far most likely explanation" of Litvinenko's death was the careless handling of radioactive material..According to Dejevsky, "Scientists who know anything about polonium-210 find it hard to believe that anyone would choose it as a murder weapon against one individual, even if the purpose was to evade detection
Edited sentence: Journalist Mary Dejevsky also wrote in The Independent that the "by far most likely explanation" of Litvinenko's death was the careless handling of radioactive material..