Not to worry; they'll also have slave labour companies for that detail. And remember: they wouldn't bother, but for the public health problem that large numbers of dead bodies pose.
They better have some can’t miss weapons, because the slaves end up being the masters in those situations.
The push here is to get the numbers down. Less people, less problems. Slave labor is a headache. The resources it takes to maintain a single person in captivity is staggering. Eternal vigilance is not practical.
There was an X-files episode where Mulder was infected with a nanobot that thickened the blood in the bloodstream at the touch of a switch. You could thicken or unthicken as you pleased.
THAT’s what you’d need.