Where a jurisdiction implements a practice or procedure periodically or upon certain established contingencies, a change occurs:
The failure of the Attorney General to object to a recurrent practice or procedure constitutes preclearance of the future use of the practice or procedure if its recurrent nature is clearly stated or described in the submission or is expressly recognized in the final response of the Attorney General on the merits of the submission.
28 C.F.R. § 51.14