The Associated Press has this report on a man whose FOIA request from prison led to his freedom. Roy Brown was convicted of murdering a woman. Once he was in prison, he made a FOIA request on the case and learned that there was evidence about an ex-boyfriend of the woman that Brown and his attorneys never saw. Brown wrote a letter to the man accusing him of the crime. The man then committed suicide; a judge later ordered his body exhumed for a DNA test. The man's DNA matched that found on the shirt the woman wore the night she was murdered, and Brown was released from prison.
It's nice to see a FOIA request having this type of effect.