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'One Hell of a Killing Machine': Signature Strikes and International Law


Kevin Jon Heller


SOAS, University of London

October 30, 2012

Journal of International Criminal Justice, Vol. 11, No. 1, 2013

Abstract:     
The vast majority of drone attacks conducted by the U.S. have been signature strikes – strikes that target “groups of men who bear certain signatures, or defining characteristics associated with terrorist activity, but whose identities aren’t known.” In 2010, for example, Reuters reported that of the 500 “militants” killed by drones between 2008 and 2010, only 8% were the kind “top-tier militant targets” or “mid-to-high-level organizers” whose identities could have been known prior to being killed. Similarly, in 2011, a U.S. official revealed that the U.S. had killed “twice as many ‘wanted terrorists’ in signature strikes than in personality strikes.”

Despite the U.S.’s intense reliance on signature strikes, scholars have paid almost no attention to their legality under international law. This article attempts to fill that lacuna. Section I explains why a signature strike must be justified under either international humanitarian law (IHL) or international human rights law (IHRL) even if the strike was a legitimate act of self-defence under Article 51 of the UN Charter. Section II explores the legality of signature strikes under IHL. It concludes that although some signature strikes clearly comply with the principle of distinction, others either violate that principle as a matter of law or require evidence concerning the target that the U.S. is unlikely to have prior to the attack. Section III then provides a similar analysis for IHRL, concluding that most of the signature strikes permitted by IHL – though certainly not all – would violate IHRL’s insistence that individuals cannot be arbitrarily deprived of their right to life.

Number of Pages in PDF File: 40

Keywords: drones, signature strikes, UAVs, personality strikes, IHL, international criminal law, international human rights law, targeting, DPH

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Date posted: November 2, 2012 ; Last revised: December 22, 2013

Suggested Citation

Heller, Kevin Jon, 'One Hell of a Killing Machine': Signature Strikes and International Law (October 30, 2012). Journal of International Criminal Justice, Vol. 11, No. 1, 2013. Available at SSRN: http://ssrn.com/abstract=2169089

Contact Information

Kevin Jon Heller (Contact Author)
SOAS, University of London ( email )
London
United Kingdom
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