Accuracy is not needed.
As implied a few comments up, the mission of the police has for years not been "Find the perpetrator", but "find someone we can arrest, preferably not sympathetic or able to pay a lawyer, so we can mark this case successfully closed".
Yes, I am aware that there are many fine, honest police officers, but it chaps my hide every time I hear the phrase "a few bad apples' used as an excuse, as if the whole sentence didn't continue "will spoil the barrel". As the Wells Fargo case showed, management need not _order_ illegal/unethical behavior. They just need to lay out "proper incentives". Promotion for the team that closes most cases, traffic duty for nit-pickers who insist on solving crimes.