A sergeant on the scene claimed to have turned his camera on, but the camera didn't record. He'd later say his camera had never malfunctioned like that before. Ditto for another officer whose camera weirdly captured footage so pixelated that it was unusable — again, no one had ever seen that problem before. A third officer says his camera malfunctioned just before the shooting. Mysteriously, the camera has not had a problem since. A fourth said his camera mistakenly became unplugged. Analysis showed it had been turned on eight minutes before the shooting, then turned off just moments before the fatal encounter. A fifth officer's camera captured 10 seconds of vague footage. It should have captured at least 30, given the camera's buffer function. He had failed to turn it on.
Read more at https://www.washingtonpost.com/news/the-watch/wp/2018/06/28/the-ongoing-problem-of-conveniently-malfunctioning-police-cameras/?noredirect=on&utm_term=.1a337f6eb380.