There's a fine line between being Q from "James Bond" and being a petty criminal.

There's a 70-year-old guy named Robert Davis from Key Largo, Florida.

And he installed remote-controlled black SHIELDS that he could roll down over the license plates on his minivan . . . so he wouldn't have to pay tolls when he went past toll cameras.

And Robert kept getting away with it until about a week-and-a-half ago, when an off-duty Florida Highway Patrol officer randomly spotted the license plate shields in action at a toll plaza.

Robert was arrested and charged with organized fraud and petit theft. 

(Florida Keys News)

(Here's Robert's mugshot.)

(And here's a video someone else shot over the summer showing the shields in action.)