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they use whats called trunking....
you know that little chirp that you hear... that switches it over so dispatch has one and the officers have another... I have a tripple trunking scanner...
also different areas use different freq...
I got em all on mine.. narc, swat, and all areas of town... I never really scan mine though I leave it on the area im in.....
scanners are great for entertainment IMO they are much better than the radio....
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