They don't have to charge you, so they don't have to prove it.
> They don't suffer consequences enough, though, and depend on citizens not knowing that what the police are doing is wrong. It's also difficult due to the "thin blue line" BS where cops are elevated above the rest of society.
The police themselves hardly ever face consequences; the settlements come from the taxpayer.
They have to have PC to arrest someone. Even if you're not charged, PC has to be there for an arrest to be justified.