Good! It's not a given. Lots of people seem to trust police implicitly.
I don't know what various regulatory environments exist for body cameras, but in an ideal world body-camera footage would be operated and held by some neutral external part and only made available as evidence in court. For example, in the UK we have the Independent Police Complaints Commission which is, in theory, independent from the police force.
From what I can tell this isn't the case in the UK, and police forces operate the infrastructure themselves.
> When a police officer returns to a station, the cameras are placed in a docking station, where the footage is automatically uploaded to Microsoft’s Azure cloud platform.
> Officers also decide how to categorise the footage, and whether it will be useful as further evidence. If the officer concludes it is not useful, the footage will be automatically deleted after 31 days – but if it is considered useful as evidence, it can be stored indefinitely, Hutchinson said.
> In practice, the cameras are not always rolling, and it is up to the individual officer when to turn them on or off.
http://www.techworld.com/security/met-police-picks-microsoft...
That seems like a recipe for unaccountability and a real missed opportunity, especially for the Metropolitan Police who have a bit of a track record for abusing technology... https://www.theguardian.com/politics/2011/may/18/police-dna-...