But the bluff doesn't reveal all the cards, as there is always more than one interpretation (there's room for maneuver).
The bluff is checked at night.
But where autopsies are prohibited, the player can emphasize something, and this will give him away to other players. No one prohibited mumbling with a closed mouth.

Барон "Vampires"
Отдай свои прошлые сны,
В сомненьях себя обрети,
В бешеном танце душа кружится!
Не думай, что будет потом,
Здесь и сейчас мы живем,
Стань хоть на миг сам собой, слышишь!