Hallett's research centers on the threshold that separates the amity of peace from the enmity of war, and when and how is that threshold reached and breached. His work is greatly influenced by the jus fetiale (law of negotiation and diplomacy) of early republican Rome and by Gandhi and Martin Luther King, Jr. What he finds of interest in both sources is their emphasis on conflict resolution instead of conflict escalation.
The Lost Art of Declaring War (University of Illinois Press, 1998).
Explores the historical, philosophical, and moral issues surrounding the declaring of war.
"Dishonest Crimes, Dishonest Language: An Argument about Terrorism" in Understanding Terrorism: Psychosocial Roots, Consequences, and Interventions, edited by Fathali M. Moghaddam and Anthony J. Marsella (American Psychological Association, 2003).
Attempts to define and understand terrorism.
"Misunderstanding the Power to Declare War: Arthur Schlesinger, John Yoo, and the War Power Resolution," Social Science Research Center Working Paper Series, June 30, 2012.
Evaluates three explanations for the incapacity of Congress "to declare war": lack of political will, organizational incapacity, and inappropriate function. Offers UN Security Council as model declarer of war.
Declaring War: Congress, the President, and What the Constitution Does Not Say (Cambridge University Press, 2012).
Analyzes constitutional dysfunction and the conflict resolution potential of declarations of war.