Since we are talking about HS I'm thinking about fake HS for traitors here is an example.
D:Puts his HS on the ground, "D" leaves the place.
T:comes to the HS and destroy's it, puts a fake HS at the place that the real was on.
I:near-death starts to use the fake HS and loses health and getting killed.
Or dart shooter so it will posion the other player and only antidote that the detective has will be able to use it against the poison.