Some common signs that someone is a witch include:
If someone has a wart, it may be the case that their spirit familiar is feeding on their body. Such warts often appear between the fingers.
During the Salem witch trials, women were more likely to face a witchcraft accusation than men. The rationale behind this was that women were more weak minded. They were especially likely to face trials if they were middle aged and unmarried.
Witches may appear socially unacceptable in public. For example, they may spend a lot of time being angry, engaging in irritating behavior or they could act strangely around children.
If someone issues a threat and it later comes true, it is a sign they are a witch.
Another sure sign that someone is a witch is their spirit appearing in a house late at night.
During witch trials, suspected witches faced tests to determine whether they were guilty:
Individuals who were able to swim were found guilty of witchcraft. Those who were innocent usually drowned.
People who could say the Lord's Prayer without making mistakes or omissions were not witches.
Sometimes judges would bake a cake using the suspected witch's urine and feed it to a dog. If the dog died, they were found guilty.