Forensic expert from Hyderabad, R Prasad, submitted all related documents before special CBI judge S Lal here.
Suresh Kumar Singhla, a senior Central Forensic Science Laboratory scientist, was also questioned by lawyers.
The hearing will continue tomorrow.
Teenager Aarushi and domestic help Hemraj were murdered in 2008 and her parents, dentists Rajesh and Nupur Talwar, are being tried for the killings.
