"Dr. Mary's Monkey"

[Steve Franklin]

The Lovers, Lee and Judyth, get the best lines in this screenplay:

"We've created a galloping cancer," [said Judyth Baker].… We are developing this weapon to eliminate a head of state. But what if we get Castro? Will they really just throw this stuff away?"

"It could be used as a weapon of mass distraction," [said Lee Harvey Oswald] simply.

"Yes… think I'll Hitler would have loved this, to use against the Jews in those camps. They could say a plague went through."

"Or to eliminate Negroes in Africa," Lee said with a cold tone in his voice."

Page 391, "Me and Lee"

Lines that are overblown, anachronistic, and strike me as hugely unlikely.

If you're calling the term "weapon of mass destruction" anachronistic, there's a decent article at Wikipedia under that heading, which traces the first use in English to the Archbishop of Canterbury in 1937. It was used in reference to nuclear weapons as early as 1945.