You do not need farrier certification or be on any registered list to be a farrier in the U.S.A. Farrier Certification is highly suggested by American owned and operated Farrier and Horseshoeing Schools offering USA Farrier Education
American organized farrier associations can suggest you join a group and acquire certification, but Farrier Certification is NOT mandatory in the U.S.A.
If you google this question…you will read about European rules without mentioning any names. It is confusing to anyone who googles that question. Be careful what you read.
Contact an American owned and operated farrier school or association for the correct information.