Republican presidential candidate Ben Carson on Tuesday suggested using "medical ways" — such as decreasing people's conscious defenses — to extract information from terror suspects.

"I believe there are a number of ways to extract information, including some medical ways of putting people into a less-than-conscious state, which allows information to be extracted," he said on CNN.

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The retired neurosurgeon said the average person might understand it as "truth serum." He specifically referenced sodium amytal as a possible treatment.

"There are ways where you decrease a person's conscious defenses, and they might be much more willing to give information," he said.

Carson added that there are a variety of different things that can be used for this purpose.

"We've made some advances in that kind of science," he said.