What is the rules for tourniquet?

A tourniquet should be applied only in cases of severe bleeding that cannot be controlled by direct pressure. It should be placed 2-3 inches above the injury site, avoiding joints, and tightened until the bleeding stops. It's crucial to note the time of application and seek immediate medical help, as prolonged use can cause tissue damage. Never remove a tourniquet once applied; instead, leave it in place for medical professionals to address.