On Facebook and YouTube you can find countless jubilant stories about the Healy, a small device that you can clip to your sweater or shirt and is said to promote your health through frequency therapy. You can treat any complaint with it: from sleep disorders and pain to depression and anxiety. And not only that, you can also get rich from it, the sellers promise. But behind all the promises there appears to be a shadowy world, a network of traders that takes advantage of thousands of vulnerable people.
