District of Columbia Code Division VIII. General Laws. § 50-1501. a. Display of vehicle identification tags.

(a) Vehicle identification tags shall at all times be securely fastened in a horizontal position to the vehicle or trailer for which they are issued and in a place and position to be clearly visible and legible.

(b) No insignia, emblems, brackets, holders, mounts, frames, trailer hitches, or couplings shall be mounted in such a way as to hide or obscure any portion of the vehicle identification tag or render any information on the vehicle identification tag illegible.

(c) No plate cover, glass, plastic, or any other type of material or substance shall be placed, mounted, or installed on or over any vehicle identification tag, regardless of the legibility of the information on the vehicle identification tag.