The well-known Malleus Maleficarum--a handbook on witches--written by a Catholic clergyman and containing a Papal bull acknowledging that "sorceresses are real and harmful through their involvement in the acts of Satan," makes references to witches and the "left side" of their bodies twice (e.g., "it is their practice to lie down on their left side in the name of their own and of all devils). This is a separate issue from your other question. MM agrees that prosecution is best left to the secular courts and then proceeds to offer a step-by-step guide on how to do it! I don't know what you think you are proving, as the Church appeared to back the prosecution of witches wholeheartedly.