It's okay for chemical weapons it's okay for biological weapon at the toxin and bacteriological, but not the viral.

CENTERFORSECURITYPOLICY: Remarks to the Council on Foreign Relations

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