What is truth serum?

Here's an article on "truth serum":

The only way that interrogators can tap a man's memory is to ask him. But what if the person is unwilling to spill the beans or, at least, the real ones? If only there were only a way to plug a USB cable to the back of Kasab's head and just download the experiences.

While such technology may be the stuff of science fiction, Indian government officials have announced they will employ another technique that seems to leap from the pages of a 1940s pulp novel: truth serum. Also known as narcoanalysis, administering psychoactive drugs for interrogation purposes has been around for just under a century, but it has been viewed with skepticism from the start. Indeed, the practice is banned in most democracies, and evidence obtained from such an interrogation would have a hard time making it into an American court.

What does the term "truth serum" mean?
That's a term that was used to describe the use of certain drugs, most commonly barbiturates like sodium amytal and sodium pentothal, to try to extract truthful statements from people about their past experiences.  What the term really meant was that the people who used the serum believed that it made people unable to censor themselves and they would just empty their memories into a narrative statement.

A must read for some thriller writers, who far too often rely on "truth serums" to leap forward a story.

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