Must make a request to desist prior to use of force Law enforcement arrest Non-deadly force reasonably necessary to make an arrest or prevent a felony or misdemeanor. Deadly force Limited to dangerous felonies where officer reasonably believes suspect is guilty of a felony and force used was necessary for arrest. Also for crime prevention. Also available for self-defense or defense of others. Authorized to prevent escape from jail.
Private person can use deadly force only if person killed did in fact commit a felony.
No mistakes allowed. Reasonable belief standard used for non-deadly force. Lacked capacity to form specific intent mens rea required for crime. Traditionally D has to show some evidence, p has burden to prove not insane beyond a reasonable doubt. Retardation Repeated criminal or antisocial conduct is not enough.