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Criticism for mixed messaging. joining me now is dr. jeanette nesheiwat, fox news medical contributor, also a family and emergency medicine physician. so, dr. jeanette, cdc messaging is confusing. what does the american public need to know about testing for covid-19? >> sure. so for testing, if you test positive for covid, for example, if you're having symptoms -- fever ors runny nose, cough, con congestion -- you're supposed to quarantine for five days so we can try to minimize the spread of virus to others. after five days if you're feeling better and you have no m symptoms, you have no coug...

Steve? >> reporter: jon, watching these counterterrorism exercises can really get your heartbeating, and that's the goal, is to take these federal responders and put them in situations of real pressure. >> let's go. [gunfire] >> reporter: at the federal law enforcement training center in brunswick, georgia, they use blank ammunition -- >> police! >> reporter: -- but real actors. >> you can't simulate behavior. you have to use people to simulate behavior. >> reporter: 60,000 federal agents a year come to the 1600-acre site complete with mock airplanes, a test track. the important thing in perfo...