Stop police officers colluding when writing their reports.
Even when an innocent man is shot dead by police, the police officers are still allowed to get together and collude when writing up their "evidence." Is it any wonder that the version of events they collectively come up with always seems to absolve them all of any blame?
Each police officer at an incident should simply write down the truth as they remember it. If that is what they are doing, why should they need to collude?
Why does this idea matter?
Police officers are human and make mistakes. This is something we should expect and allow for. If a police officer makes an honest mistake, they should admit it so that everyone can learn from that mistake. This way, we can have more trust in our police.
We don't expect our police to be perfect! However, what we should never tolerate is police officers lying or conspiring to manipulate evidence in order to "beef up" their case or protect themselves from perfectly reasonable criticism.