Wait at least 30 seconds. Submerge the probe into boiling water. Consult your local health department for advice on this method. Fact of the matter is color can be deceiving. For example, a hamburger that is brown in the middle may not be cooked long enough to destroy E. coli.
Poultry can be just as deceiving when trying to judge doneness by color alone.
Local requirements may vary, so consult your local health department for more information.