Spectral evidence was evidence that came to the accuser in the form of a vision or dream. So, if I accuse you of witchcraft, and proceed to say that I’ve had dreams and visions of you doing the devil’s bidding, that is sufficient enough evidence to convict you of witchcraft. The argument against spectral evidence was that the devil could take any shape, so even if someone claims to have had a vision of a particular person performing witchcraft, it could’ve just been the devil pretending to be said person. There was, however, a counter-argument that argued that the devil couldn’t inhabit somebodies body without their permission. Several accused women were in fact convicted of witchcraft by way of spectral evidence.