There are a lot of rumors out there about Tourniquets and some could cause a lot of problems for a person suffering from a life threatening bleed. Most of these rumors come from the old way of doing things.
If you haven't been to first aid training in a few years, you might be thinking you might be operation under the wrong information.
Study referenced in the video:
Get a CAT Tourniquet at the Mountain Man Medical Website:
And while you're there, give the Yellowstone and Sweetwater Trauma Kits a look.