From [HERE] If cops have the ability and opportunity to record a traffic stop, should it be held against them when they don't? Arguments have been made to that effect for a few years now. Dashcams have been in wide use for at least a couple of decades. Law enforcement agencies all over the US are issuing body cameras to officers. But it seems whenever something questionable happens, footage is nowhere to be found, or what there is of it is almost useless.

Unfortunately, years of discussion by (mainly) defense lawyers hasn't resulted in policy changes. Worse, it hasn't budged the judicial needle much. In rare cases, the absence of footage is used against officers, but in those cases, it mainly seems to be because efforts were made to destroy footage already captured.

In this case [PDF] US v. Darrell Hunt reviewed by the Sixth Circuit Appeals Court, no effort was made post facto to destroy footage. Instead, an officer proactively prevented footage from being created by disabling the dashcam recording the traffic stop.