I suggest that if you were to keep the kill warrants but you wanted to change it, I would say that the player who has a warrant on him/her player, can KOS any cops in a 50 meters range (similar to the raiding radius for a cop KOS radius while raiding). This prevents cops from sniping you from a super long range and you not having any chance to defend yourself. This also makes it a bit more of a trickier thing to do for cops and the player who has a kill warrant on him/her. If they shoot cops outside the radius, it can be considered KOS. I do agree with Apples that players don't have a chance to defend themselves until they are damaged. I say that you should either just remove it or make it possible for a player to do something, like I talked about above.
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