In Kelley Armstrong's book "The Reckoning," the character Chloe describes a method she uses to identify ghosts. She explains that when she encounters someone who appears to be standing still and isn't dressed in a dated uniform, she tests their nature. Her approach involves asking the person to walk through furniture.
If the individual reacts as if the request is nonsensical or impractical, Chloe takes this as a sign that the person is not a ghost. This reflects her unique perspective on the supernatural and showcases her determination to distinguish between the living and the undead.