The Special Investigation Team (SIT) carries out polygraph test on 3 key witnesses--Sanjay Dewan, Narain Singh and Bajrangi-- in Sunanda Pushkar death probe. Last month, the three witnesses had agreed to undergo the lie-detector tests. A Special Investigation Team (SIT) of the Delhi Police had earlier said that Congress leader Shashi Tharoor's domestic help Narain Singh, driver Bajrangi and family friend Sanjay Dewan might be "hiding something" including "material facts" and asked a Delhi court for permission to subject them to a polygraph test.

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