I started a longer post, but decided to abandon it because it was getting to full of itself. But the gist of it was this:

Any law-enforcement/legal system is flawed in that it will 'convict' a proportion of people who are truly innocient, while 'releasing' a proportion of people who are truly guilty. That is unavoidable. What is controllable to some extent, though, is the balance: you can convict more of the guilty if you are also prepared to convict more of the innocent; or vice versa.

Any I right, Villan and Backwoodsman, in thinking your preference is that mistakes should be of the 'convict the innocent' kind, rather than 'release the guilty'. I take it as read that you want to do all that you can to avoid mistakes in the first place.