People like to make up regulations when they think someone is doing something that they don't approve of.
61.303
(b) A person using a U.S. driver's license to meet the requirements of this paragraph must—
(1) Comply with each restriction and limitation imposed by that person's U.S. driver's license and any judicial or administrative order applying to the operation of a motor vehicle;
(2) Have been found eligible for the issuance of at least a third-class airman medical certificate at the time of his or her most recent application (if the person has applied for a medical certificate);
(3) Not have had his or her most recently issued medical certificate (if the person has held a medical certificate) suspended or revoked or most recent Authorization for a Special Issuance of a Medical Certificate withdrawn; and
(4) Not know or have reason to know of any medical condition that would make that person unable to operate a light-sport aircraft in a safe manner.