Illegal to develop as a weapon (weaponize).
International law forbids it.
Part of that agreement we’ve been seeing regarding the BioLabs in UKR.
We (as an industrial concern in the US) must account for every molecule of Phosgene we handle on site (mostly byproduct).
Annual ChemWeapons report.
The refined version has that smell; your version has carries that burnt bitternes.
I assume the new refrigerants do the same. When I was working on that stuff it was R12/22. Of course those became evil when the DuPont patent ran out.