To be honest it will really be down to the force in your area, and will depend on how strict they are. I had mine on the Lexus for a year or so and was pulled a couple of times and they never even mentioned it. I just was just unlucky as the vosa guy was out with the traffic cop for the day teaching him how to use the machine, so i was used as a guinea pig and ended up £30 lighter with £100 tints in the bin.