As long as they were considering "Jack Bauer" scenarios, why not just use Sodium Thiopental... Truth Serum.

Sodium thiopental, better known as Sodium Pentothal (a trademark of Abbott Laboratories), thiopental, thiopentone sodium, or trapanal, is a rapid-onset short-acting barbiturate general anaesthetic. It is an intravenous ultra-short-acting barbiturate. Sodium thiopental is a depressant and is sometimes used during interrogations--not to cause pain (in fact, it may have just the opposite effect), but to weaken the resolve of the subject and make him or her more compliant to pressure.^{[citation needed]} Thiopental is a core medicine in the World Health Organization's "Essential Drugs List", which is a list of minimum medical needs for a basic health care system.^[3]

Truth serum

Thiopental is still used in some places as a truth serum.^[8] The barbiturates as a class decrease higher cortical brain functioning. Some psychiatrists hypothesize that because lying is more complex than telling the truth, suppression of the higher cortical functions may lead to the uncovering of the "truth". However, the reliability of confessions made under thiopental is dubious; the drug tends to make subjects chatty and cooperative with interrogators, but a practiced liar or someone who has a false story firmly established would still be quite able to lie while under the influence of the drug.^[9]

Surely, it's efficacy is no more dubious than beating the hell out of someone, or nearly drowning him. And certainly it's more "humane." After all, it's one of the drugs used for administering the death penalty via lethal injection.

Maybe instead of lawyers, they needed a "script doctor."