Answer:
Witches had to be accused, of course, and when they were they were either guilty or lying. No "witch" was deemed innocent. There were many tests that they put women, or men, through such as; casting a woman into the water, bound, and if she floated she was a witch, but if she did not, she was innocent. There was no winning The Floating Test.
As for trial by jury, the accused were jailed and examined by two Magistrates. If they believe the testimonial of the accused to be guilty, they were presented to a Grand Jury where they would be deemed so in front of the community. If guilty, they would hang, if not, they would live; but that was hardly the outcome.