It is insane how often body cameras are 'knocked' or 'dropped' in these cases. Is the tech seriously that poor? This is not even the most ridiculous case; there have been times when five body cameras were all said to have malfunctioned at once, or even seven dashboard cameras. [1] [2, for non-paywall version]
How these forces are allowed to get away with this is ridiculous.
[1] https://www.washingtonpost.com/news/the-watch/wp/2018/06/28/...