As outlined in that report, the most severe threat facing any transportation system is a weapon of mass destruction such as a nuclear device or a biological weapon.

正如报告所概括的，所有交通系统面临的最严重威胁，是大规模毁灭性武器，例如核设备或生物武器。

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According to an FBI news release, Mr Dutschke was charged with "knowingly developing, producing, stockpiling, transferring, acquiring, retaining and possessing a biological agent, toxin and delivery system, for use as a weapon, to wit: ricin".

BBC: Ricin suspect Everett Dutschke appears in court