+New System for Fake Death, perhaps?

I kinda found it a bit silly that someone could easily fake their deaths in the game. And I was wondering in an rp perspective. How would someone be able to fake their deaths without any pulse? and Why wouldn't the killer just check the pulse to see if the person is alive and check  if the person just flopped on the ground pretending to be dead? Alas you can't do that. So I had an idea if perhaps Fake Death can only be caused with a certain item and/or perhaps if the person doesn't wake up from it in a certain amount of time, it would cause some sort of consequence/side effect from it or perhaps have the ability to check one's pulse. I would like any input/opinion about this idea and perhaps other ideas as well.