Republican presidential candidate Dr. Ben Carson said Tuesday that there’s a more humane, “medical way” to get information than torture.

Carson and CNN host Poppy Harlow were discussing GOP presidential frontrunner Donald Trump’s views on the effectiveness of torture when the retired neurosurgeon suggested the United States could use a “truth serum” instead.

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

Harlow asked Carson to clarify what he meant by “medical ways,” so Carson put it in simpler terms.

“Well, the average person might understand it as truth serum,” he said. “But, you know, there are ways where you decrease a person’s conscious defenses and they might be much more willing to give up information.”

“What is truth serum?” Harlow asked. “What is that?”

“Sodium amytal,” Carson said. “There are a variety of different things we can use now. We’ve made some advances in that kind of science.”

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