Several years ago mention was made of Chinese “death ambulances”, traveling execution vans. The unmarked vehicle arrives at the site where police load the condemned into the back of the van, where they are tied to a gurney. Then either before they leave, en route, or when they arrive at their destination for body disposal, the prisoner is executed by lethal injection.
Who knows what substance is injected into them to kill them, but in that the Chinese gave a bill for the price of the bullet previously used to execute their relative, to the family of the dead, I doubt that it is an expensive drug. Most likely something cheap, like bleach or ammonia.
“Several years ago mention was made of Chinese death ambulances, traveling execution vans. The unmarked vehicle arrives at the site where police load the condemned into the back of the van, where they are tied to a gurney.” . . . &c.