LVA technology can detect deceptive answers by analysing and identifying various types of stress levels, cognitive processes and emotional reactions that are reflected in different properties of a suspect’s voice. The SFSL had facilities to conduct polygraph tests. Now, it has procured the LVA technology.
“It will be used on a need basis,” director general of police (DGP) Sunil Kumar Bansal said.
Recently, the crime branch had taken the assistance of Central Forensic Science Laboratory (CFSL), Delhi, to conduct an LVA test on ASI Gopal Das, accused of killing minister Naba Das.
The SFSL authorities said they procured the LVA software with the help of an Indian vendor.
“Our forensic psychologists are being trained on the use of the technology. We will use the technology only after our experts are properly trained,” an SFSL official said.
The crime branch had subjected English lecturer Punjilal Meher to an LVA test in connection with the sensational wedding gift blast case in which two members of a family at Patnagarh, Balangir district, had died on February 23, 2018. A team of Central Forensic Sciences Laboratory from Delhi had conducted the LVA test on Meher at Raipur in Chhattisgarh.
“We were planning to subject Gopal to LVA test at our SFSL in Bhubaneswar. However, our experts are still being trained. The reports produced by the LVA technology are accepted as corroborative evidence in the courts of India,” a crime branch officer said.
The crime branch officer said while the conventional lie-detection test relies on measuring and recording physiological parameters such as heartbeat, blood pressure, breathing and skin conductivity, the Layered Voice Analysis test functions on variations in a voice and does not need any wires or sensors.