Relates to civil action for unlawful acts of force or failure to intervene by a law-enforcement officer or correctional officer,creates a civil action for the use of unlawful acts of force, including deadly force, or failure to intervene as required by law, by a law-enforcement officer or correctional officer while performing his duties for a public entity or private police department,provides that a public entity or private police department employing such officer is liable for any injuries sustained.