Very good question. With each state in the US, there is the division of Professional Affairs, which governs over the professional licenses of folks for that state. So for chiro, you would go to the state you live in and look for the web address in the google search engine, for example, "State of California Chiropractic License", with this search, you will get the address website of your state chiro division, then look for the link that states, "check license or verification of license". I hope you find this info beneficial. Have a good Day.