The phrase "suspected witch" refers to someone whom people think might be practicing witchcraft or having supernatural powers, but no solid evidence has been found. Full definition
You could argue that, if they really believed in the Bible, they'd be long past being just jerks and wind up monsters burning suspected witches, stoning adulterers, and outright killing gays, instead of just bullying them into killing themselves. (religion.blogs.cnn.com)
Burning suspected witches was once the moral thing to do, but not any more. (religion.blogs.cnn.com)
Of course is it any different when one would burn a suspected witch, heathen, or heretic, on a stake? (religion.blogs.cnn.com)