> Witnesses often lie when it’s to their benefit.
Law enforcement officers too — right???
Absolutely and any other government official for that matter including the current president. On that case I mentioned I had to interview over a thousand people just to find a small group who were all good, hardworking legal immigrants to tell me what really happened and the truth. I went behind them checking the facts from other witnesses, their backgrounds and their family members, explanations / reasons that they migth have told the truth (for money, revenge, or any other reasons).
That’s why you have things like corroborating evidence — something that the shooting officer in this case doesn’t have.