Presumably this sort of thing will become harder to maintain as bodycams become more prevalent.

It seems plausible that anti-corruption NGOs could request the bodycam footage (anonymized, I suppose) under public records disclosure laws. (e.g. see https://www.rcfp.org/bodycam-video-access/, though I'd be really interested in what others think about the likely legal interpretations of disclosure requirements.)

Yet another reason to push for more bodycams, and auditability/disclosure of that footage; sunlight is often the best disinfectant.