Here's a place to get you started:

http://www.afn.org/~afn09444/scanlaws/

In general, if you were to get your ham license, you would be mostly
exempt from most scanner laws.
73s Mike
====================
Geek wrote:
I recently got my CDL license and am thinking of taking an over the road
job. I've been a scanner for years, but never looked into the laws. I've
heard that Michigan has very tough anti-scanner laws. Does anybody have any
inside into other state's laws. Do these laws differentiate between a
handheld scanner and a mobile scanner?

Perhaps there is a web site dedicated to this very question.