There is no police car dash cam video. The Ferguson PD purchased two dashcams last year, but did not have the money in the city budget to have them installed.
I’m surprised at the notion that ANY police car today, well into the 21st century, is not equipped with a dash cam. If there wasn’t, I expect SOMETHING recorded the incident (police radio logs, nearby surveillance cameras, people with cell phone cameras, etc); if not, the absence thereof does not diminish the testimony of all other related incontrovertible proof (perp robs store, perp assaults clerk, perp walks down street away from victim, cop confronts perp, cop suffers skull fracture, perp terminated with multiple front entry wounds).