Additional Solicitor General Sanjay Jain, who appeared for Delhi Police in the Delhi High Court, says that this new tool of investigation, which relates also to the personal questioning of certain individuals, is being resorted to ensure that “no stone is left unturned”. It is a peculiar case, he says, since nobody is an accused and nobody from the family has made any allegations. Generally, in a case where forensic experts give inconclusive report, no FIR is registered. However, here, the case was registered after one year of death and probe had to be carried out. According to Jain, over 90 persons have been questioned and help of forensic experts has been sought on seven occasions but nobody has given a conclusive opinion so far.