“How Biological and Chemical Warfare Works.” 2009.
“A History of Biological Warfare from 300 B.C.E.
On November 25, 1969, the President declared thatthe United States unilaterally renounced first use of lethal or incapacitating chemical agents andweapons and unconditionally renounced all methods of biological warfare.
Common Biological and Chemical Weapons Agents - WebMD
While the United States did not consider prohibition of one of these classes of weapons lessurgent or important than the other, it held that biological weapons presented less intractableproblems, and an agreement on banning them should not be delayed until agreement on a reliableprohibition of chemical weapons could be reached.
BIOLOGICAL AND CHEMICAL WEAPONS, MIDDLE EAST …
On February 14, 1970, the White Houseannounced extension of the ban to cover toxins (substances falling between biologicals andchemicals in that they act like chemicals but are ordinarily produced by biological or microbicprocesses).
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Many states maintained chemical weapons in their arsenals to deter the use ofthis type of weapon against them, and to provide a retaliatory capability if deterrence failed.
Chemical, Biological and Radiological Weapons - Public health
A number of nations, including the SovietUnion and its allies, continued to favor a comprehensive agreement covering both chemical andbiological weapons.