The law is complicated, fluid and extense. There's no way a police officer will know the law like a lawyer and, by design, they can't know the outcome of a tria

The law is complicated, fluid and extense. There's no way a police officer will know the law like a lawyer and, by design, they can't know the outcome of a trial beforehand, so it's impossible to fully know the law in that sense, as trials are what ultimately decide the laws. I'm not saying that QI doesn't need to be reviewed, just that the notion that police officers should never take into custody someone who's innocent is not realistic. It just can't work together with democracy and the rule of law. The only possibility of police officers only arresting guilty people is if they are themselves the judges.