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That happens to be one of the 6 scanners in my news truck. It's passable as a scanner - it's preprogrammed for every state's highway patrol, local police, weather, and emergency frequencies. When an active cop frequency is scanned, a big light on the front lights up red and it emits a very annoying series of beeps. It's very reliable as far as alerting you to when it receives cop radio transmissions.
Here's where its shortcomings lay. First off, you don't know where the cop is. It could be receiving transmissions from a cop sitting in the donut shop using his extender. It could be detecting a radio call 30 miles away. You just don't know, so you'll start ignoring the warnings.
The other problem is that cops who are sitting on speed patrol usually don't use their radios until they're calling in to run your plates. That means your scanner will generally alert you to the speed trap when you're already pulled over.
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