http://www.huffingtonpost.com/2011/08/03/isaac-turnbaugh_n_917477.html
April 12, 2002 Declan Lyons was shot and killed outside of the restaurant he worked at. About a month after the shooting, Isaac Turnbaugh, Lyon’s co-worker and good friend, went to a party and allegedly told multiple friends that he shot Lyons. A friend told Turnbaugh’s mother and she contacted the police. Turnbaugh denied killing Lyons when police questioned him. After police arrested him, Turnbaugh was diagnosed with a serious mental illness. In court, Turnbaugh’s lawyer argued that someone who consumed mushrooms then confessed to multiple things like shooting Lyons and being responsible for 9/11 could not be held seriously. April 6, 2004 after five hours of deliberation, jurors acquitted Turnbaugh of murder.
This was a very tough case for the police. It took one month before they had leads on Lyon’s shooting. When Turnbaugh became a suspect police could not find any motive for him killing Lyons. Everyone at their work (Lyons and Turnbaugh) said the two were really good friends and there was no strain in the friendship.
About nine years later Turnbaugh contacted the police and confessed to the murdering Lyons. There was nothing the police could do, because Turnbaugh is protected from being tried twice for the same crime under the double jeopardy clause (Fifth Amendment). Some believe he confessed due to his mental illness and he is having some sort of relapse. Others think he really is guilty of committing this crime because he gave details that matched the case. Authorities still believe Turnbaugh killed Lyons, but they cannot do anything about it because the Fifth Amendment bars them from doing so.
The Framers created the double jeopardy clause so American citizens will not be tried for the same offense twice. This is a blessing and a curse. On one hand if someone is innocent they will not be tried for the same crime more than once, even if the prosecutors do not like the outcome. On the other hand, if someone is acquitted of an offense and later admits he/she did in fact commit the crime there is nothing the authorities can do about it.