The United States released a bacterium into the New York Subway to people's vulnerability!

There's been a number of human experimentation in the United States considered unethical.

For example, in 1966, the US Army released a bacterium called Bacillyus globigii onto the New York Subway System.
The bacterium itself is harmless, but the fact that they would release a biological agent is considered controversial.

Why did they do it? It was part of a study that meant to test the vulnerability of subway passengers to actually harmful biological agents. The Army also subjected Chicago passengers to the same tests.

Read the source to learn about more human experiments in the US.