dynamitedjs said:
3. The reason I am asking I would like to see dispatched calls and IM's of my local PD. I want to set up my laptop to do this.
Can it be done? In some cases, yes. In others, it can if you spend enough money and know a thing or two about radio modems. In still others, you can't no matter what you do. You have to do some homework - find out what they use and go from there. It will make a big difference.
Is it legal? This is a real sticky question. So far, the short answer is "Yes, if the system isn't encrypted". However, if you are stopped by your local PD and they see their own CAD system running on your laptop you will have to answer some rather nasty questions, especially in these post 9-11 times we live in. You can bet at the very least, it will spell out a ride to the station and hours of intensive interrogation. They will take away your laptop, and most likely secure a warrant to search your home. In the name of "evidence" they will gather up your computers and your scanners and it will be weeks or months before you can get them back. When you do get them back, don't be surprised if they weren't taken care of very well: "Oops, looks like someone dropped a bowling ball on your laptop. Sorry." It may sound paranoid but this type of thing really happens.
In short, they will make certain that you know how much they dislike what you've done.
If you are intercepting NCIC data it gets worse as the feds then have to get involved. Even though there's a chance you will not be successfully prosecuted they can make your life a living hell, just do some reading up on what happened to Bill Cheek:
http://www.qsl.net/n4tyv/freq/Bcheek.htm.
IF you decide to do it, I would caution against 1. Intercepting PD systems or any data system that carries NCIC data and 2. Sharing the research you've done in a public forum such as this. It's all too easy to find you if the feds really want to - just ask Bill's wife. Good luck!
-AZ