The courts provide decisions based on laws when they are at their best.
Justice sometimes has nothing to do with the law.
Often laws are written to try to provide justice but it doesn't always happen. And in the case of cell phones laws are still in a catch up basis with justice likely years away and still not guaranteed.
Granted holding a cell phone to your ear is very likely to provide a distracted driver but conducting business on the phone with a unit mounted to the dash is no guarantee of non distraction and may also create a distracted driver who based on some laws may be legal. They say Justice is blind and that doesn't give me a lot of comfort.
The United States of America, founded on the principle that "all men are created equal; with unalienable rights; that among these are life, liberty, and the pursuit of happiness"
Happiness 2007 Red & Black C50 Happiness