Circumstances in which the killing of a human being is legally permissible

Although intentionally killing a human being is usually illegal, there are some limited circumstances in which the intentional killing of a human being is legally permissible, according to specific restrictions.
== Capital punishment ==
Capital punishment, also called the death penalty, is the killing (execution) of a convicted person by a governmental authority for a particular crime, such as murder or treason (capital crime). 
== Warfare ==
War - what is it good for? Absolutely nothing! Tell that to the government who send our fellow citizens overseas to fight foreign wars. Sorry, got a little carried away there.
Anyway, legal warfare occurs when one state declares war against another.