Tennessee V. Garner

Under the Fourth Amendment of the U.S. Constitution, a police officer may use deadly force to prevent the escape of a fleeing suspect only if the officer has a good-faith belief that the suspect poses a significant threat of death or serious physical injury to the officer or others.

When a non-violent felon is ordered to stop and submit to police, ignoring that order does not give rise to a reasonable good-faith belief that the use of deadly force is necessary, unless it has been threatened.