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Would deploy. >> anthrax is virtually the ideal biological agent for weapons purposes. it's a bacterium that is very hard to -- it can survive all kinds of conditions. it can persist. it is very deadly. you can aerosolize it and spread it around with sprayers. >> reporter: june 2015 kim jong un tours the pyongyang biotechnical institute. the north koreans said it was a factory which manufactured pesticides but some machinery on display raised alarm. >> it seems they have invested a lot in imported equipment that cost them a lot and is i think unreasonable for any civilian application. >> repor...

Convert biological agents into sprayable form. south koreans would be in the direct line of fire, a threat taken seriously enough that south korea holds mock drills for wmd attacks. but american troops in south korea could also be hit. >> a small aircraft basically overflying them, individuals who are infected infecting them. there's just no way to guarantee and protect u.s. troops from this. >> reporter: officials say there's no evidence that north korea has yet produced a biological weapons. but with the assassination of his half-brother this year, kim jong-un has shown the willingness to us...

Scale, and other machinery used to convert biological agents into sprayable form. south koreans would be in the direct line of fire. a threat taken seriously enough that south korea holds mock drills for wmd attacks. but nearly 38,000 american troops in south korea could also be hit. >> a small aircraft, basically, overflying them, individual who infected infecting them. there's just no way to guarantee and protect u.s. troops from this. >> reporter: officials say there's no evidence that north korea has yet produced a biological weapon. but with the assassination of his half-brother this year...