Just this showed up as an advertisement for me on facebook. I don't own an Iphone, and even if I did I doubt i would pay for this app, but it is still interesting. If i traveled a lot more I might though. Claims to be updated with all the laws for all 50 states current as of yesterday.
http://www.apps.schematixdesign.com/ibeararms/
i don't have itunes installed on my office computer so i can't follow the link to the itunes store and look at the price.