In a nutshell: Suspect is arrested and put in jail because they have reason to believe that he's guilty of a theft. But he has not been officially convicted/had a trial. Before it comes to trial, new evidences comes up to prove that he's innocent of the crime--and someone else is arrested for the crime. How long would it likely take between the discovery of the new evidence, and the release of the (cleared) suspect from jail? This is all assuming it becomes quite obvious, due to the new evidence, that the suspect is not guilty.
I've Googled everything I can think of along the lines of "prison release process," and "acquittal," 'n such, and read up on what I could find about the actual release process when someone comes to pick the prisoner up. But I really need to know the process/time frame for getting a prisoner officially cleared so that they can be released--and my Google-fu has failed me utterly. *headdesk*