(GUARDIAN) — Legal and medical experts are questioning the decision of a judge in Colorado to allow James Holmes, the suspected gunman in the Aurora cinema shooting, to be tested with a “truth serum” should he plead not guilty by reason of insanity.

Judge William Sylvester ruled that in the event of Holmes pleading insanity his prosecutors would be permitted to interrogate him while he is under the influence of a medical drug designed to loosen him up and get him to talk. The idea would be that such a “narcoanalytic interview” would be used to confirm whether or not he had been legally insane when he embarked on his shooting spree on 20 July last year.

The precise identity of the drug that would be used has not been released, other than a statement that it would be “medically appropriate”, but it would most likely be a short-acting barbiturate such as sodium amytal.

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