If a taxicab operator desires to substitute one vehicle in place of another, and if such vehicle to be substituted complies with the taxicab operator’s license, and the taxicab operator brings both the vehicle under the license and the vehicle to be substituted to a place designated by the sheriff’s department, a sheriff’s deputy may remove the city license plate from the licensed vehicle and place it on the vehicle to be substituted. If the sheriff’s deputy finds that it is impossible or impracticable to bring the licensed vehicle to the place designated, he may permit the licensee to detach the city license plate therefrom by breaking the seal and removing the screws and may waive the requirement that such vehicle be brought to such designated place. Under no circumstances may such seal be broken or removed by anyone but a sheriff’s deputy. (Ord. 505 § 3. 2002 Code § 6-21.8).