At least it makes more sense than some of the old witch-hunting tests -- I believe at one point that a women held underwater who drowned was considered innocent, while a woman who survived had clearly used supernatural powers.
Of course then they had to let her dry out before they burnt her at the stake (yes, I know, that wasn't as common as we're led to believe.)
More common than it should have been, although more often for "heresy" than witchcraft.
Burning at the stake. Only my strong belief in humanity prevents me from recommending it for certain modern miscreants, however.