They get tied up with a big thick rope and get thrown into a river. If they float she was a witch but if they sunk they were innocent.
That is one
1. Way :
A very common way to find out was to take a huge metal pin and stick that into the skin of the witch. When this method was used people were trying to find the invisible or strange looking mark. Because on the devils mark they would not feel any pain. Mostly after a long time feeling the terrible pain they would have stopped screaming because they got used to feeling the pain. But when exactly that happened the witch hunter would have believed to find the mark and bring the witch to a witch trial.
1. Way :
A very common way to find out was to take a huge metal pin and stick that into the skin of the witch. When this method was used people were trying to find the invisible or strange looking mark. Because on the devils mark they would not feel any pain. Mostly after a long time feeling the terrible pain they would have stopped screaming because they got used to feeling the pain. But when exactly that happened the witch hunter would have believed to find the mark and bring the witch to a witch trial.