<P>This book analyses the US drone attacks against terrorists in Pakistan to assess whether the ''pre-emptive'' use of combat drones to kill terrorists is ever legally justified. </P><P></P><P>Exploring the doctrinal discourse of pre-emption vis-¿is the US drone attacks against terrorists in Pakistan, the book shows that the debate surrounding this discourse encapsulates crucial tensions between the permission and limits of the right of self-defence. Drawing from the long history of God-given and man-made laws of war, this book employs positivism as a legal frame to explore and explain the doctrine of pre-emption and analyses the doctrine of the state''s rights to self-defence as it stretches into pre-emptive or preventive use of force. The book investigates why the US chose the recourse to pre-emption through the use of combat drones in the ''war on terror'' and whether there is a potential future for the pre-emption of terrorism through combat drones. The author argues that the polic