Stringers
The best place online to listen to online police scanners is onlinepolicescanners.org. Listening to the police scanner online should not damage your other scanners.
Police scanner let's you listen to police radios and NASCAR scanners are scanners that let's you listen to NASCAR team chatter
If you want to listen to police scanners for free, download free online scanner from the link below. This program is free, therefore you can't control the scanner but you can find one close to your area to listen to.
Police scanners check for police radar beams so that a person knows whether or not they are being monitored. A computer scanners scans a physical document and makes it into a computer document.
One can find police scanners when one goes to a store called Scanner Master. This store carries police scanners made by Uniden and Bearcat. Price varies by brand and model.
There are lots of places to listen to scanners online. You won't be able to hear lots of big cities, due to Digital Frequencies, but you can listen to Countiy, and township calls usually. Go to places like www.radiorefrence.com and select your state and county. there should be an online scanner for your county.
radioreference
There are in total 131 Police stations in the Metropolitan boroughs, with the lowest number being 2 Police stations and the highest 6.
Specialty hobby and electronics stores such as Radio Shack carry police scanners. Additionally one can buy police scanners online from ScannerMaster and Walmart. There are a number of apps for smartphones that also act as police scanners and many local jurisdictions are now broadcasting their emergency channels over the internet as well.
This site has all frequencies in that area: http://www.radioreference.com/apps/db/?ctid=2623 Looks like you'll need a digital police scanner to listen though as the signal is encrypted. You can get one here: www.zipscanners.com/police-scanners/shop-by-format/digital-police-scanner-radios.html
Modern police scanners are accurate to with about 3 mph.
Police scanners are radios that monitor the police channels on the police radio. You can hear the officers being dispatched to calls and hear them talking back and forth. Be aware, however, that since 9/11 most big-city police radio channels are now encrypted and cannot be monitored.