the law does exist for safety reasons, The bumper is meant to soften your impact if you were to get into a accident or something. The way the states see it if you adjust your ride height either too high or too low. you could be risking yourself and anyone else you get into accident with. Some officers are complete dicks about it. and some really dont care. I have friends that have trucks that are on hydro suspensions and when they get pulled over for stuff their usually a dick about it and drop the truck to the ground. and the cop always trys to give them crap about it being an unlawful height. if i remember correctly for florida atleast, that little booklet they give out for you to take your drivers license test, has something about ride height in it. If not you can always get online and search it up.