Do states adopt CDC health guidelines as law?
Yes, states in USA adopt CDC guidelines as law.
To use an at-home test, you will collect a nasal specimen and then test that specimen by using the given kit. Wait for the results and wash your hands thoroughly after the procedure.
Covid 19 rapid test is very accurate, though some false negatives have been reported.
Both the centres are centres of exellence and can be trusted equally.
One can learn more about Covid 19 is from World health organisation and CDC where they provide updated information for everyone.