Longshot Republican presidential hopeful Ben Carson suggested the United States should add the use of “truth serum” to its list of interrogation tactics for suspected terrorists.

Carson made the comments during an appearance on CNN, after he was asked whether he agreed with frontrunner Donald Trump that waterboarding is “the least form of torture.”

“I believe there are a number of ways to extract information, including some medical ways of, you know, putting people into a less-than-conscious state which allows information to be extracted much more humanely,” Carson, a retired neurosurgeon, said.

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