Unlike previous wars, our enemy now is a stateless network of religious extremists. They do not obey the laws of war, they hide among peaceful populations and launch surprise attacks on civilians. They have no armed forces per se, no territory or citizens to defend and no fear of dying during their attacks. Information is our primary weapon against this enemy, and intelligence gathered from captured operatives is perhaps the most effective means of preventing future attacks.

Declarations of war have never been a constitutional requirement for military action abroad. The United States has used force abroad more than 130 times, but has only declared war five times - the War of 1812, the Mexican-American War, the Spanish-American War, and World Wars I and II.

It has never demonstrated any desire to provide humane treatment to captured Americans. If anything, the murders of Nicholas Berg and Daniel Pearl declare al Qaeda's intentions to kill even innocent civilian prisoners.

While Taliban fighters had an initial claim to protection under the conventions, they lost POW status by failing to obey the standards of conduct for legal combatants: wearing uniforms, a responsible command structure, and obeying the laws of war.

The United States is at war with the al Qaeda terrorist group. Al Qaeda is not a nation-state and it has not signed the Geneva Conventions. It shows no desire to obey the laws of war; if anything it directly violates them by disguising themselves as civilians and attacking purely civilian targets to cause massive casualties.

Declarations of war have never been a constitutional requirement for military action abroad.

It is easy now for critics to claim that the work was poor; they haven't produced their own analyses or confronted any of the hard questions. For example, would they say that no technique beyond shouted questions could be used to interrogate a high-level terrorist leader, such as Osama bin Laden, who knows of planned attacks on the United States?