I know in pa and I understand in most other state's it's legal to have a moblie police scanner and use it in a car or anwere for that mater as long as it's not being used in a crime. ( it say's crime not felony ) so if you for what ever reason have a scanner don't be a idiot and run from jonny law or rob a bank it will get you nipped in the butt big time. other wise most of us law abiding folks don't have musch to worry about though.
No offense but let's not turn this into a legal debate or a flame thread. Let's please get back on topic...
I believe alot of scanners have serial interfaces and software to program them and tune with them. If you search around google you may be able to find quite a bit. There is a new scanner out that has a GPS capability that will automatically select the frequencies of interest in your area. It may be possible to program it to do quite a few interesting things with that feature as well as it's "close call" feature that will only alert you with transmissions in your area. I might play with this sometime down the road but I've been tied up with other things.
in no way did i mean that you dont have a nice car. and i never said my car was better than yours. a skyline is a sweet ride. what i meant was you have a car that you probably race in and thats why you want a police scanner to see where the cops are when your doing a 100mph on a side street.