You know, witches can float, and they are burned. Wood can float and is burned. Therefore, witches must be made of wood. Ducks can also float, which means it must weigh the same as wood. This leads to the conclusion that if a woman weighs the same as a duck, that means she's made of wood, and therefore a witch. It's completely logical!
In England in the middle ages, suspected witches were thrown in the rivers, if they floated they were a witch and were subsequently burned, and if they didn't, they weren't a witch but were dead anyway.
Scientist think, that the contaminated bread created the ideal conditions for the salem witch trails and their deadly outcome
Here is a link if you want to learn more
One of the test for witchcraft was getting one of the girls to urinate on a piece of bread
Then the bread was fed to a dog.
Because the girls were high on LSD and the bread was contaminated, well the dog went bananas
Everybody at the time, thought this was clear evidence of demonic possession
Do you know any other infallible test for witchcraft?