Florida Statutes Title XXIII. Motor Vehicles § 320.061. Unlawful to alter motor vehicle registration certificates, license plates, temporary license plates, mobile home stickers, or validation stickers or to obscure license plates;  penalty

A person may not alter the original appearance of a vehicle registration certificate, license plate, temporary license plate, mobile home sticker, or validation sticker issued for and assigned to a motor vehicle or mobile home, whether by mutilation, alteration, defacement, or change of color or in any other manner.  A person may not apply or attach a substance, reflective matter, illuminated device, spray, coating, covering, or other material onto or around any license plate which interferes with the legibility, angular visibility, or detectability of any feature or detail on the license plate or interferes with the ability to record any feature or detail on the license plate.  A person who violates this section commits a noncriminal traffic infraction, punishable as a moving violation as provided in chapter 318.