The speaker had hardly finished his first sentence when about 25 Yale Law School students in the audience stood up and sheathed their heads in black trash bags, in imitation of hooded military prisoners at the Abu Ghraib prison in Iraq.

The students were protesting an appearance at the Law School on Thursday evening by Jay Bybee, a judge on the U.S. Court of Appeals for the Ninth Circuit who, when he was head of the Bush administration's Office of Legal Counsel, signed off on a controversial policy for interrogation and detention of "military combatants" — what critics have labeled the "torture memo."

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But as he began to speak, the protesters, clustered in the center seats, stood and pulled the bags over their heads. A few other audience members clapped, several of the protesters said afterward. Bybee, visibly annoyed, stopped speaking.