It would be a bit overpowered to be honest, say one of your buddies is called out and everyone is looking for them, you could just drop a body and go HAY GUYS I KILLED HIM IM INNO, then people think you are innocent and stop looking for your buddy.
Also in the 2v1 situations, you either dont reply and hide so they think you are dead, roam about and pick them off or dont let yourself get into that situation as often by killing the detectives asap (Which traitors should be trying to do anyway)
Not OP, as there would probably be a "proven"-tag on the traitor, that dropped the body of his fellow T and ID it, but as soon as his fellow mate gets spotted again, they are both on KOS, which cuts the time they have to kill everyone as soon as the body is dropped. You understand what I mean?! Still in big interest for this feature, sounds like a fun new tool to me.
plus, it costs one credit, which is not necessarily available to the T that wants to help his comrade...
What do you say, BKU?!