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Categories of tests, and in each of those categories theres a bunch of manufacturers, a bunch of different ways you can do the tests. its all awfully complicated for the average american to figure out. >> reporter: over-the-counter at home tests from these manufacturers are now authorized by the fda. experts say they all work well. >> in general for the purposes that most people are using tests today, which is to ask am i a risk to others around me, the rapid tests you can pick up on the shelf t...