The Board of Doctors. These are recognized authorities on what it takes to provide proper medical care.
Of course there are other boards who may approve of the care of the family “doctor.” They fall under the category of chiropractors, faith healers, witches etc. As long as the Doctor is honest about his professional background, I have no problem with him calling himself a practioner, healer or quack. He just has no authority to call himself a Doctor, either by peer review, or by his educational or legal history. Telling others about him does NOT make me a liar anyway does it?
I never accused you of lying. I just question whether there is one authentic “board of doctors” which can certify the qualifications of all practitioners. You may personally give credence to one or another board but that doesn’t make it the final authority applicable to all.