Roy Heck was convicted of manslaughter and given a 15-year sentence. From prison, he tried to file a civil rights suit against law enforcement officials, accusing them of violating his constitutional rights during the investigation and prosecution of the case. When the matter reached the U.S. Supreme Court, a rule was announced that can often be invoked to bar certain lawsuits against police.
The court noted that there is a “strong judicial policy against the creation of two conflicting resolutions arising out of the same or identical transaction.” Also, the only means for attacking the validity of a criminal conviction is by direct appeal or habeas corpus in the criminal courts.
For these reasons, the court ruled that a person who has been convicted of a crime cannot undermine the validity of his conviction by obtaining a contrary result in a civil suit. In other words, if a criminal jury has found someone guilty beyond a reasonable doubt, a civil jury cannot be allowed to find that he was not guilty by a preponderance of evidence.
The court explained that where a conviction has not been reversed on appeal, expunged by executive order, or called into question by issuance of a writ of habeas corpus, no suit can be maintained based on the same events if “a judgment in favor of the plaintiff would necessarily imply the invalidity of his conviction or sentence.”
For example, suppose you arrest someone for resisting or obstructing an officer in the lawful performance of his or her duties, and the person pleads guilty or is convicted at trial of that offense. As long as the conviction has not been overturned, this person cannot sue you for illegal detention, false arrest, excessive force, or false imprisonment. If you had committed any of these acts, you would not have been in the lawful performance of your duties; the guilty plea or conviction establishes that you were obstructed while lawfully performing your duties; therefore, Heck bars the lawsuit.