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NYPD faces backlash as it prepares to encrypt radio communications | New York | The Guardian
(www.theguardian.com)
This is a most excellent place for technology news and articles.
It's worth noting that in Italy, police communications are encrypted (they use TETRA radios, like most police forces in Europe). I'm not saying it can't help prevent this, but when weighing the cost and benefits of encryption for police radios, we should take into account that this benefit is not absolute.