If non-reputable agencies wanted to do illegal research, there is literally nothing that would stop them. Look at NSA spying, MKUltra, and the failed nerve gas test that killed hundreds of sheep.
The US still has the largest arsenal of nerve gas in the world, much of it which is still in the queue to be destroyed, much of it still leaking.
The US still has the largest arsenal of nerve gas in the world, much of it which is still in the queue to be destroyed, much of it still leaking.