A single person is chosen for this, at round start they are given whatever they wish to protect themselves from everyone (no weapons and they cannot go off station or anything that would gib them). At 10 minutes shift time there would be CC announcement saying something like this
"ATTENTION! There is an individual that is one of Nanotrasen's most wanted on your station! their name is (NAME HERE) and they are wanted for (CRIME HERE [chosen by selected person]), they are KOS by anyone, not just sec. They are to be brought to CC Alive. Whoever presents this criminal to me (NAME HERE) the CCO, will be rewarded with a 10 spesos bonus."
and the target person would get a killsign and anyone could kill them legally, even tiders, of course they would be revived.