The victim's family has been taken to Delhi for their brain mapping as well as narco test by the CBI.

The father of the victim sister's Sohan Lal, Jeevan Lal and witness Ram Babu have been taken to Delhi for the test.

Before, CBI had conducted a lie detector test of the family members as well.

The two girls were gang-raped and found hanging on the tree in Badaun.

The brain mapping and narco test of 5 accused in the case has already been done by the CBI.