License plate scanners:
(tried to attach a pic but of course....  -just right click-copy/paste to browser for photo)
The plates you saw were probably mounting points.
It's an extra set of eyes in the fight against auto theft. Of course it's going to pick up the BS traffic/parking tickets and such too 
http://www.sun-sentinel.com/news/loc...,6025039.story
http://www.foxformayor.com/pdfs%20fo...%208.24.08.pdf
http://www.policeone.com/police-prod...-license-tags/
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Remember:
Artificial Intelligence is no replacement for Natural Stupidity!
Be Polite, Be Professional...and have a plan to kill everyone you meet.
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