Well just because that would be a bad dangerous idea does not mean that police will not do it. After all police uses lie detectors, fingerprinting and DNA evidence without much care for an error rate.
I hope some day there will be an episode of a crime show where by chance two teams of detectives will independently work on the same case without noticing each other and by using standard police methods they will come to completely different incompatible conclusions and detain two different suspects who of course both confess after going through standard police interrogation. Screenwriters, use your powers for good!
(Actually Czech writer Karel Čapek (the same who invented the word robot) did practically the same thing in one of the short stories in Stories from Another Pocket, everybody should read it together with Stories from a Pocket)
I hope some day there will be an episode of a crime show where by chance two teams of detectives will independently work on the same case without noticing each other and by using standard police methods they will come to completely different incompatible conclusions and detain two different suspects who of course both confess after going through standard police interrogation. Screenwriters, use your powers for good!
(Actually Czech writer Karel Čapek (the same who invented the word robot) did practically the same thing in one of the short stories in Stories from Another Pocket, everybody should read it together with Stories from a Pocket)