But say the test giver has it, you can turn around literally right after getting tested clean and get infected, that essentially the test is only useful for the exact time you take the test. Granted if you believe the tests are useful to begin with.

But this pretty much negates any usefulness of the test as it's only right then when tested but momentarily can become infected right after.

I heard this from Joe Rogan listening to WMAL earlier this afternoon, and pretty sure I hadn't heard it before.