http://insights.globalspec.com/article/1726/body-worn-video-surveillance-in-law-enforcement
A problem with 3rd-Party Storage of Video is maintaining a proper Chain of Custody. Any breakdown in the control and documentation of the CoC for a given piece of evidence will make it inadmissible.
One will also have to prove the integrity of the evidence has been maintained (i.e. if any computer at the 3rd-Party's Storage Location has any software that can 'edit' video, then the integrity of all videos stored at that location can be called into question.
The same concerns exist with local storage, but just like with physical evidence, if the CoC is broken or integrity is compromised the Police Department has only itself to blame. With 3rd-Party Storage, there are more Chefs in the Kitchen so to speak.
Finally, the more the use of video surveillance increases, the higher the resolution will become, and the greater the need for better video compression technology.
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