The whole justice system is messed up. Police investigators and district attorney are too carnivorous, too efficient at what they do. They'll cheat and lie to get people to confess or bear false witness because they feel that the ends justifies the means. They completely lack the ability to tell whether a suspect is innocent. "That's not my job," they'll tell you. But if it isn't there's, it won't be anybody's because precious few suspects can afford the investigative resources at the disposal of the government.
And that's really messed up.