Worse policing also leads to more incorrect clearings.

Who knows how many murders were incorrectly pinned on husbands or wives, or known petty criminals, or tramps? The same technology we use to find murderers can also exonerate people.

We also tossed out a lot of bogus methods based on pseudo-science and learned a lot about the reliability of witnesses; and all the modern technology exposed many expert witnesses as charlatans.