It was Nixon who halted our Bio warfare program, entirely for humanitarian reasons.
Bio-warfare does have risks and drawbacks unique to the type , but not so much that they could not be deployed , when successful they are a cheaper way to kill lots of enemy.
They apparently teach courses in Intensive paranoia in the War College classes Curtis LeMay was this guy's hero.
Curtis Lemay should be every Americans Hero, no telling how long WWII would have been without Harris and LeMay.
I have been to the Navy version of that school. It was called NBC defense when I went there. It is really frightening stuff, it can be coped with, but the collateral damage potential is huge. This is not a consideration for enemies that do not have a humanitarian scruple.
The Soviet Union for example brewed up tons of bio weapons and came up with interesting means of delivery. On the small scale they had a BBgun disguised as an umbrella that was used by assassins to deliver tiny doses of powerful toxins. On the large scale they had stockpiles of toxic and bio weapons many times the stockpiles of ours that our forces took twenty years to safely destroy.
Don't feel safe just because it would be difficult for terrorists to do , terrorists are just as clever as we are, and in recent times have become pretty well financed.
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Also nature delivers a bio terror surprise every few years just because pathogens are still having evolution.
Good preparation for bio attack and good preparation against natural plague would be pretty much the same preparation.