Critics say the results are more truth-y than truthful. The Guardian writes:
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It is the sort of scene that belongs in a film noir, not a 21st-century democracy: an uncooperative suspect being injected with a dose of “truth serum” in an attempt to elicit a confession. But some detectives in India still swear by so-called narcoanalysis despite India’s highest court ruling that it was not only unreliable but also “cruel, inhuman and degrading”.
The technique is back in the news after officers from India’s Central Bureau of Investigation asked a judge for permission to administer sodium pentothal to a high-profile Indian politician and his financial adviser embroiled in a corruption case.
There are no official figures for the number of suspects who have been subjected to narcoanalysis, but VH Patel, deputy director at the Directorate of Forensic Sciences in Gujarat, western India, [said] he had personally conducted narcoanalysis in nearly 100 cases.