The CBI had asked the Ghaziabad Sessions Court to grant it permission to conduct narco tests on Aarushi's parents.
The Talwar couple arrived here on Tuesday, Feb 9. Preliminary tests to determine their health preparedness have been done.
The Aarushi murder case, which rocked the country a year and a half ago, returned to the spotlight with the CBI seeking permission from the court.
The court heard the CBI's application, which said its probe team found fresh clues, requiring the Talwars to undergo narco tests.
Aarushi was found murdered in her Noida home on May 15, 2008. Their domestic help Hemraj was later found dead on the rooftop.