The accused duo were brought to the Directorate of Forensic Sciences in Gandhinagar city in order to undergo brain mapping and polygraph tests on 4 January 2007 and narco analysis five days later .
The accused duo were brought to the Directorate of Forensic Sciences , Gandhinagar city for undergoing a series of medical tests . 
 Brain mapping and polygraph tests were conducted on 4 January 2007 and narco analysis five days later .