New Delhi, Jun 23: Delhi Police is expected to receive Sunanda Pushkar's viscera sample report from FBI by next month which is likely to reveal the kind of poison that is suspected to have caused her death.
Delhi Police Commissioner BS Bassi today said that although the report was expected earlier, the "well-trusted lab" would have to be given the time it requires.
"The forensic science lab will take the time it requires. There are certain processes and protocols for a chemical examination. I expect the report to come by next month," he told reporters here.
Sunanda's viscera samples were sent to the FBI lab in Washington in February to determine the kind of poison after an AIIMS medical board identified poisoning as the reason behind her death but did not mention the type.
Meanwhile, Delhi Police has carried out polygraph tests on six persons, including "three prime witnesses" and is likely to conduct further tests if required.
The investigators hope both the viscera report and polygraph test reports would give a direction to the probe into the high-profile case.
Sunanda was found dead in a five-star hotel suite here on January 17 last year, a day after she was involved in a spat with Pakistani journalist Mehr Tarar on Twitter over the latter's alleged affair with Sunanda's husband - Congress leader Shashi Tharoor.