statistic. you guys have been doing this. what do we know so far about the cases where prosecutions have happened and the role video has played? >> of course. video has played a major role. the two that will stick out are sam dubose here and walter scott in charleston. those are two of four. there have been four cases of the 558 where an officer in 2015 has been charged with a crime of shooting someone. in all four cases, there is video of the shooting. walter scott, samuel dubosa, eric harris in tulsa, oklahoma, and then a fourth shooting of david, a 59-year-old white man stopped at a traffic stop for an expired emissions ticket. ran. got out of his car, was tackled into the snow by an officer, tase asked then shot in the back twice. so that video has not been released, although there is still a decision being made by a