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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.
Theres a case for real time communication having at least some channels with dedicated encryption, just because every criminal and their mother is capable of buying a police scanner. Especially if there's records and transcripts for after the fact review.
The problem is that current police forces simply can't be trusted to use it for above the board means. More than likely it'd be used as a means of subverting law and order, not upholding it.
They already get around the open radio issue by calling each other, messaging, etc. but encrypting all communications would make it even worse.