From 1940 to 1979, the Ministry of Defence performed a series of secret chemical warfare experiments on the UK public which included planes dropping large amounts of poisonous zinc cadmium sulphide on the population. This wasn’t publicly known until 2002. See the original Guardian article.
Interesting, and disturbing that this went on at such a grand scale!
As an aside though, zinc cadmium sulphide isn’t harmful to humans.
But that doesn’t distract from the fact that our govt spent 30 years dropping chemicals on us to “see what happens”!!!
It appears stupidity and lack of common sense allows them to test for the obvious. Poison kills. How many people to you have to kill before you prove this point!