I came across this trailer by chance today and I wanted to watch the full documentary after, but I couldn't find it to watch online anywhere after spending about 1/2 searching; so PBS must have it locked down pretty tight, {or there are other 'powers' at work who don't want us to see it.}  

If any of you can find a link to the whole thing, please share it.  Looks like some scary shit.

Synopsis: 

This documentary looks at the US government's programme to develop biological weapons of mass destruction, which began under the direction of President Franklin Roosevelt and continued for over two decades.

In 1942, the US had just been attacked at Pearl Harbor and was fighting a world war on two fronts. As doctors and scientists prepared to exploit their new understanding of germs, the stage was set for America to enter the business of biological warfare. The work proceeded under the same top security classification as the parallel Manhattan Project to build an atomic bomb. But when World War II ended with the bombing of Hiroshima and Nagasaki and the world saw what atomic weapons could do, many questioned the need for biological warfare. Powerful influences in Washington were at work, however, and the Cold War years saw this programme intensify, with testing carried out in locations across the land. But on November 25 1969 the research came to an end when President Richard Nixon abruptly cancelled the project. The research may have been abandoned, but scientific knowledge cannot be destroyed. Future generations bear the responsibility of ensuring that it is never used.

 

A few reference links for more information: 

http://en.wikipedia.org/wiki/Biological_weapons

http://en.wikipedia.org/wiki/United_States_biological_weapons_program

http://en.wikipedia.org/wiki/United_States_and_weapons_of_mass_dest...