Their argument being, they were sure they had trashed all the cameras, and therefore they had a reasonable expectation of privacy! I hope they don't get away with this, but they're cops so they probably will. But if the judge allows this crazy argument, will everybody then be able to use it?

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Cops filmed behaving badly say pot shop’s camera illegally recorded raid
Destructive cops caught playing darts, perhaps eating marijuana edibles.
by David Kravets - Aug 8, 2015

Did you hear the one about the cops not wanting to use a store's surveillance tape to help solve a crime?

Who could blame these Santa Ana cops? Video shows them smashing surveillance cameras, harassing a woman in a wheelchair, and perhaps even munching on marijuana-infused products after they stormed a medical marijuana shop in Southern California, which was being investigated for allegedly operating unlawfully in the city.

Three of the unidentified cops are demanding that a judge block the police department from using the tapes against them as the department investigates the officers' conduct during the May raid. The cops at the center of the investigation say the Sky High Medical Marijuana Dispensary illegally recorded them because the officers believed they had disabled all the store's cameras and therefore had an expectation of privacy "that their conversations were no longer being recorded," according to the cops Aug. 5 lawsuit. (PDF) The suit says the tapes were also "edited" and cannot be relied upon.

A hearing on the issue is scheduled for Monday in Orange County Superior Court.

The dispensary's attorney, Matthew Pappas, said in a telephone interview with Ars that "there is nothing doctored in those videos. Those videos are what the officers did."...

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http://arstechnica.com/tech-policy/2015/08/cops-filmed-behaving-badly-say-pot-shops-camera-illegally-recorded-raid/