"Harlan Yu, a tech policy researcher and co-author of the Body Worn Camera scorecard, a 2016 report rating body camera policies for different police departments, told Gizmodo that departments considering adopting body cameras should require statements from officers before they view any footage.
“We don’t want these to be gotcha tools,” Yu said. “[But] I think it’s important for an investigator to suss out why there are differences [between a video and an officer’s statement] and whether the differences are legitimate.”"