You can't prove it was us.
Barium is good for you! Some people put it on their salad!
Rep. Kucinich's bills that would have banned poisoning you without your approval got "referred to committee" and never became law.
H.R. 2977: Space Preservation Act of 2001
H.R. 3616: Space Preservation Act of 2002
H.R. 3657: Space Preservation Act of 2003
H.R. 2420: Space Preservation Act of 2005
Not that it would've mattered. In other news, the (former head of) EPA said they were gonna make sure everybody was safe.
How'd that work out?
Safe from prosecution, maybe? First responders & workers dropping like flies, while the major culprits are writing books, giving paid speeches, and the ever popular "spending more time with the family".