Police wants polygraph test on three witnesses to Sunanda Pushkar's death case
The police have asked a Delhi court for permission to subject the Tharoors' domestic help Narain Singh, driver Bajrangi and family friend Sanjay Dewan to a polygraph test, reports said.
All three witnesses have been summoned by the court on May 20.
Sunanda Pushkar was found dead in their hotel suite on January 17 last year, days after she publicly accused her husband of having an affair with a Pakistani journalist.
After a medical report attributed Sundanda's death to poisoning police registered a murder case in January this year, without naming any suspect.
The former union minister has been questioned by police on the circumstances in which Ms Pushkar left him at the Delhi airport and checked into the hotel two days before her death.
Narayan Singh, Bajrangi and Sanjay Diwan have also been questioned more than once.