$5.00 says you do that, and the first time they try to scan your plate while you're driving, and they will cite you for an improper tag display. Arizona passed a law that if you have a licsense plate frame and it covers the top portion that displays the state name, it is illegal and you can be stopped for it.
They'd have a hard time winning if the entirety of the plate was clearly visible to the human eye, absent an addition to the law specifically barring interfering with machine-reading of the plate. It would only cause problems with cameras without an IR filter, which I presume law enforcement would use unless they didn't care about being able to use the machines at night.
Additional
lights are against the law. The dictionary definition of "light" includes electromagnetic radiation capable of causing
visual stimulus.
Edited to add: If the barcode has letters and numbers associated with it, it is illegal to cover it up:
2. The license plate shall be securely attached to the rear of the vehicle, except truck-tractor plates which shall be attached to the front of the vehicle. The Tax Commission may, with the concurrence of the Department of Public Safety, by Joint Rule, change and direct the manner, place and location of display of any vehicle license plate when such action is deemed in the public interest. The license plate, decal and all letters and numbers shall be clearly visible at all times. The operation of a vehicle in this state, regardless of where such vehicle is registered, upon which the license plate is covered, overlaid or otherwise screened with any material, whether such material be clear, translucent, tinted or opaque, shall be a violation of this paragraph.