What should you do in life-and-death situation?

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PHOENIX -- What if you got caught in a life-and-death situation at work, at home or while you're out running errands? Would you know what to do?

Former U.S. Marshal Don Tucker has 40 years of federal police work under his belt and he's even protected presidents, so he has an idea what to look for and how to act. Scott Pasmore finds out more.