The problem with the person who was defibbed shooting someone is they are still bound by the rules of TTT, meaning people could mistake him/her for RDM. And i doubt anyone will go to the length of writing it out in decals first.
The fact that they can't talk is interesting, it would be better if it only works for a couple of minutes after someone dies to add some realism, and maybe not if they were killed with a headshot.
Also it would encourage traitors to dispose of bodies more so this is quite a clever idea actually.
Indeed, i like the headshot idea, certain injuries would be unable to be defibbed from such as fire, headshots, stuff like that.
Or if you really want to test if someone is traitor, you just shoot them and go, Oh, if you're not a traitor, I'll bring you right back!
Would be a one use item, will be a waste on one person.
Hell i'd be happy with a test.
Emphasis on people who didnt read the O.P. first!
1. They cannot talk or type.
2. They Cannot see spec chat once they are brought back to life.
3. Undroppable.