Not that I've ever trusted the gov't. (going to public "schools" cured me of that early on), but this just seems to beat all:
Immediately after World War II, researchers at Vanderbilt University gave 829 pregnant mothers in Tennessee what they were told were "vitamin drinks" that would improve the health of their babies, but were, in fact, mixtures containing radioactive iron, to determine how fast the radioisotope crossed into the placenta. At least three children are known to have died from the experiments, from cancers and leukemias. Four of the women's babies died from cancers as a result of the experiments, and the women experienced rashes, bruises, anemia, hair/tooth loss, and cancer.
And that's not all.
Nobody can disconvince me that the Feds (or whoever it might be) aren't using "persistant contrails" as a camouflage for other vile experimentation or worse.