I haven't had a plate mounted in the front for almost 2 years now. Ive only gotten one ticket for it and one verbal warning. The one ticket was much better then getting a gathering on a rest-stop/street-racing ticket I could have got! Right now its not even in the front window! (*knock on wood*)
Right now its mounted on a home made frame that I keep in the back seat. My excuse is "I was taking photos of the car so I removed the front plate, and due to the cold weather I haven't had a chance to re-mount it