704.1  Reasonable force.
  “Reasonable force” is that force and no more which a reasonable person, in like circumstances, would judge to be necessary to prevent an injury or loss and can include deadly force if it is reasonable to believe that such force is necessary to avoid injury or risk to one’s life or safety or the life or safety of another, or it is reasonable to believe that such force is necessary to resist a like force or threat. Reasonable force, including deadly force, may be used even if an alternative course of action is available if the alternative entails a risk to life or safety, or the life or safety of a third party, or requires one to abandon or retreat from one’s dwelling or place of business or employment.
[C51, §2773; R60, §4442; C73, §4112; C97, §5102; C24, 27, 31, 35, 39, §12921; C46, 50, 54, 58, 62, 66, 71, 73, 75, 77, §691.1; C79, 81, §704.1; 81 Acts, ch 204, §2]

“Dwelling” defined, see §702.10