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 could be encompassed by that justification and, in particular, whether that justification would apply when the target is a U.S. citizen. The analysis here leads to the conclusion that it would.

A lethal operation against an enemy leader undertaken in national self-defense or during an armed conflict that is authorized by an informed, high-level official and carried out in a manner that accords with applicable law of war principles would fall within a well established variant of the public authority justification and therefore would not be murder. See, e.g., 2 Paul H. Robinson, Criminal Law Defenses § 148(a), at 208 (1984) (conduct that would violate a criminal statute is justified and thus not unlawful “[w]here the exercise of military authority relies upon the law governing the armed forces or upon the conduct of war”); 2 LaFave, Substantive Criminal Law § 10.2(c) at 136 (“another aspect of the public duty defense is where the conduct was required or authorized by ‘the law governing the armed services or the lawful conduct of war’&hairsp;”); Perkins & Boyce, Criminal Law at 1093 (noting that a “typical instance[] in which even the extreme act of taking human life is done by public authority” involves “the killing of an enemy as an act of war and within the rules of war”).

The United States is currently in the midst of a congressionally authorized armed conflict with al-Qa’ida and associated forces, and may act in national self-defense to protect U.S. persons and interests who are under continual threat of violent attack by certain al-Qa’ida operatives planning operations against them. The public authority justification would apply to a lethal operation of the kind discussed in this paper if it were conducted in accord with applicable law of war principles. As one legal commentator has explained, “if a soldier intentionally kills an enemy combatant in time of war and within the rules of warfare, he is not guilty of murder,” whereas, for example, if that soldier intentionally kills a prisoner of wara violation of the laws of war“then he commits murder.” 2 LaFave, Substantive Criminal Law § 10.2(c), at 136; see also State v. Gut, 13 Minn. 341, 357 (1868) (“That it is legal to kill an alien enemy in the heat and exercise of war, is undeniable; but to kill such an enemy after he has laid down his arms, and especially when he is confined in prison, is murder.”); Perkins & Boyce, Criminal Law at 1093 (“Even in time of war an alien enemy may not be killed needlessly after he has been disarmed and securely imprisoned….”). Moreover, without invoking the public authority justification by its terms, this Department’s OLC has relied on the same notion in an opinion addressing the intended scope of a federal criminal statute that concerned the use of potentially lethal force. See United States Assistance to Countries