The cross-examination of London-based forensic expert,Andre Semikhodski,who had appeared on behalf of Rajesh and Nupur Talwar,ended on Friday.
He also criticised police and said that they should have collected evidence in a more professional manner.
The Talwars are standing trial for the murder of their 14-year-old daughter Aarushi and domestic help Hemraj on the night of May 15-16,2008.
Semikhodski denied the charge that the report prepared by him was done in consultation with Nupur.
Semikhodski also denied that he had given a wrong statement after receiving a call from the CBI in 2009.
I had sent an email to Nilabh Kishore,the superintendent of CBI,Dehradun,in June 2010 in response to an email. I did not receive a call from CBI in 2009 and neither did I receive a call from the agency thereafter, Semikhodski said.
Semikhodski had previously denied the prosecutions charges that he wasnt competent to analyse the sample and said the DNA report submitted in the case could lead to a miscarriage of justice.
His criticism of Dr B K Mahapatra,a forensic scientist at Central Forensic Science Laboratory,Delhi,continued on Friday.
It was Mahapatra who had prepared the report for the CBI. Semikhodski said that he didnt know that Mahapatra was a examiner certified by the NABL.
I do not agree with the opinion stated by the Centre for DNA Fingerprinting and Diagnostics and Centre for Cellular and Molecular Biology,Hyderabad,that Low Copy Number (LCN) DNA testing could not be performed on the exhibits related to the case,due to contamination caused to the multiple handling and extraction of DNA, Semikhodski said.