How about a case where the only real evidence actually showed the accused man to be Innocent.

Didn't stop months of investigation and prosecution though.

http://www.telegraph.co.uk/men/the-filter/my-year-of-hell-commuter-of-preposterous-sexual-assault-ca...

The CPS even slowed the CCTV images down so they looked as thought they were taken at three second intervals instead of one second.

It's what happens when listen and believe affects investigation.