Delete Video Of Criminal Activity - Help

We are reviewing stories where users are being accused of tampering with video, specifically deleting / removing it.

In my experience, VMSes almost never allow a user to delete video manually (i.e., pick a time frame / camera and delete it). Video obviously can be cycled over and cameras might be set to longer or shorter recording durations. Additionally, someone could go and find the directories on the recorder where video files are being stored and delete it there (assuming they can access that).

Does anyone know of any other techniques to delete recorded video? Does anyone know any VMSes that allow it as a 'feature'?

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