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From the Schneier on Security blog
This is not about mass surveillance of mail, this is about the sorts of targeted surveillance the US Postal Inspection Service uses to catch mail thieves:
To track down an alleged mail thief, a US postal inspector used license plate reader technology, GPS data collected by a rental car company, and, most damning of all, hid a camera inside one of the targeted blue post boxes which captured the suspect’s full face as they allegedly helped themselves to swathes of peoples’ mail.