This ruins the whole point of the Detective role. Every situation regarding DNA and it's outcome is up to the Detecive if they are wrong they suffer a karma loss, if you kill someone that tried to RDM you report them and move on. What you are trying to do is ruin the gamemode itself by adding rules that are not needed.
Players could claim in every situation the other person shot first killing masses of innocents and you cannot act on DNA because it would be RDM.
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