Some agencies got VERY good at designing chemicals to torture people, to the point where they got so good at it that they ran out of test subjects because all of them started dying/suffered from drug induced psychosis months if not years later

One of their milder products;

https://en.wikipedia.org/wiki/EA-3167

Incapacitating effects can last anywhere from 5-10 days, sometimes manifesting as a full 3-day peak of vivid hallucinations, along with prolonged confusion, amnesia, and inhibition of speech and cognition. Some subjects exposed to the drug would not fully recover for almost 20 days. Even six months after exposure, a few subjects demonstrated significant increases in the scores on the hypochondriasis, depression, hysteria, psychasthenia, schizophrenia, and mania scales. The drug's potency caught the attention of the military, which considered weaponizing EA-3167 for topical use, potentially even through a handshake.