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The central probe agency has appealed to the city-based Sealdah court seeking permission to conduct the test on Roy, he said.
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During a narco analysis test, a drug sodium pentothal is injected into the body of the subject which takes him to a hypnotic state, and his imagination is neutralised, the CBI officer explained.
“In most cases, the accused gives the true information,” he said.
The hearing related to the CBI’s appeal is expected sometime this afternoon.
The CBI has already conducted polygraph test on Roy inside the Presidency Correctional Home.