It used to be considered credible in the past in regard to criminals having certain facial structures and features. It was "debunked" since then though.

“Thus were explained anatomically the enormous jaws, high cheek bones” and other features “found in criminals, savages and apes,” he continued. These features corresponded, he argued, to a “love of orgies and the irresistible craving for evil for its own sake, the desire not only to extinguish life in the victim, but to mutilate the corpse, tear its flesh, and drink its blood.”

It used to be considered credible in the past in regard to criminals having certain facial structures. It was "debunked" since then though.

“Thus were explained anatomically the enormous jaws, high cheek bones” and other features “found in criminals, savages and apes,” he continued. These features corresponded, he argued, to a “love of orgies and the irresistible craving for evil for its own sake, the desire not only to extinguish life in the victim, but to mutilate the corpse, tear its flesh, and drink its blood.”