Harvard professors Gabriella Blum and Philip Heymann have a new, short article online at the Harvard National Security Law Journal (which, by the way, is doing many interesting things),
Law and Policy of Targeted Killing (June 27, 2010). A version of it will appear as a chapter in their forthcoming book on terrorism and counterterrorism. It is a fine essay, not over-long, and well worth reading if you at all take an interest in these topics. Here is a little bit from the introduction (continued below the fold):
More than any other counterterrorism tactic, targeted killing operations display the tension between addressing terrorism as a crime and addressing it as war. The right of a government to use deadly force against a citizen is constrained by both domestic criminal law and international human rights norms that seek to protect the individual’s right to life and liberty. In law enforcement, individuals are punished for their individual guilt. Guilt must be proven in a court of law, with the individual facing trial enjoying the protections of due process guarantees. Killing an individual without trial is allowed only in very limited circumstances, such as self- defense (where the person poses an immediate threat) or the immediate necessity of saving more lives. In almost any other case, it would be clearly unlawful, tantamount to extrajudicial execution or murder.