6 C.F.R. § 37.71 : Domestic Security — DEPARTMENT OF HOMELAND SECURITY, OFFICE OF THE SECRETARY — REAL ID DRIVER'S LICENSES AND IDENTIFICATION CARDS — DRIVER'S LICENSES AND IDENTIFICATION CARDS ISSUED UNDER SECTION 202(D)(11) OF THE REAL ID ACT — Driver's licenses and identification cards issued under section 202(d)(11) of the REAL ID Act

(a) Except as authorized in § 37.27, States that DHS determines are compliant with the REAL ID Act that choose to also issue driver's licenses and identification cards that are not acceptable by Federal agencies for official purposes must ensure that such driver's licenses and identification cards-
(1) Clearly state on their face and in the machine readable zone that the card is not acceptable for official purposes; and
(2) Have a unique design or color indicator that clearly distinguishes them from driver's licenses and identification cards that meet the standards of this part.
(b) DHS reserves the right to approve such designations, as necessary, during certification of compliance.

6 C.F.R. § 37.71