Back in the bad old days of the Cold War the world was such a dangerous place that the U.S. Army sprayed the people of St. Louis with radioactive material.  It only makes sense that before we use chemical warfare on or enemies that we test it on our own citizens first. Luckily for most middle class and wealthy people, the majority of the radioactive spraying was targeted at the poor.

Here and here are a couple articles about it.

Some people think we are still being sprayed today.