One of biggest problems for a free society is how to keep the police from being corrupted by their power. The Romans even had a phrase for it:
Quis custodiet ipsos custodes?
“Who will guard the guards themselves?”
We may have found a partial solution in our ubiquitous recording devices and courts willing to uphold the inherent right to record police officers in the performance of their public duties.
A recording of police attempting to stop a recording device should be prima facie evidence of deprivation of rights under color of law.
It appears that backup recording devices, or devices that upload to remote cloud databases in real time, will become more popular.
And, in certain circumstances, it should also be justification for a law abiding citizen to use lethal force to protect themselves from an armed attacker. Just because someone has a badge shouldn't give them a pass on committing murder and just because an attacker has a badge shouldn't mean that a citizen has an obligation to die in the face of 'official' criminal force.