The substance used in the killing of Kim Jong-nam was a “VX nerve agent”, a highly toxic liquid used only in chemical warfare, Malaysian police have said.That pretty much makes it clear why the North Koreans were objecting to Kim's body being autopsied.
The inspector general, Khalid Abu Bakar, said later that one of the two women suspected of involvement in the poisoning also suffered its effects: “She was vomiting.”
The findings follow a preliminary analysis of swabs taken from the face and eyes of the victim, who is the half-brother of the North Korean leader, Kim Jong-un. More items linked to the attack at Kuala Lumpur airport were still being analysed and the terminal would be decontaminated, police said.
VX isn't exactly the sort of stuff that one buys at the local Agway for use as a pesticide. No doubt that a skilled chemist could synthesize some, but other than fanciful technothrillers, why would somebody, other than a state-sanctioned killer would go to all that trouble when it would be so much simpler to use more traditional methods of assassination. It's possible that the North Koreans believed that they could strong-arm the Malaysians into coughing up the body without any investigation.
Bad bet, that.