What if while arriving on scene to a burglary there is body camera footage from an officer that appears to show someone running off and away from the scene carrying [whatever was stolen] and from that footage one could possibly conclude that the personal doesn't look like the person the police decided to accuse and prosecute. This could be exculpatory evidence and help clear you of the charges. (Obviously the prosecutor is suppose to let the defendent and court know of any known exculpatory evidence, but what if the police choose to withhold it from the prosecutor/court or don't think anything of the footage? )