06/28/2010 05:12 am ET Updated May 25, 2011

Drone Pilots Could Be Tried for 'War Crimes,' Law Prof Says

The pilots waging America's undeclared drone war in Pakistan could be liable to criminal prosecution for "war crimes," a prominent law professor told a Congressional panel Wednesday.

Last month, Harold Koh, the State Department's top legal adviser, outlined the administration's legal case for the robotic attacks. Now, some legal experts are taking turns to punch holes in Koh's argument. It's part of an ongoing legal debate about the CIA and U.S. military's lethal drone operations, which have escalated in recent months -- and which have received some technological upgrades. Critics of the program, including the American Civil Liberties Union, have argued that the campaign amounts to a program of targeted killing that may violate the laws of war.