I've never run into a problem with a scanner in my vehicle, either when I was living in Michigan or here in Texas and New Mexico (of course, not getting pulled over helps, too
As for your other question regarding the "static", remember that airband signals are AM
and are thus subject to pulse interference from you vehicles ignition much more so than the FM
signals used by police, fire, ham radio, etc. As a suggestion, use an external antenna to improve the signal/noise ratio (I use one of my old VHF amateur radio mag-mounts...not an exact "fit" in terms of frequency, but it sure helps!)
Hope this helps,
I see my Cats as Companions. My Cats see Me as Furniture!