According to CBI sources, the agency requires the help from Central Forensic Science Laboratory (CFSL) on various counts, including document analysis, finger prints and digital footprints but these reports are yet to be received by the agency.
CBI has recently sent a reminder to CFSL in this regard.
The sources said the agency has registered 153 FIRs in connection with the scam but it has not yet filed the final report in any of it.
The sources claimed the probe is heavily dependent on forensic report. So, CBI cannot move forward in its probe without the reports from CFSL. Besides, the enormity of the scam spreading across the country is also posing a challenge for the agency.
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CBI had taken over the investigation in Vyapam cases on the direction of the Supreme Court.
The first set of FIRs was registered by the agency on July 15, 2015.
It is alleged that functionaries of Madhya Pradesh Professional Examination Board (MPPEB) colluded to rig the examinations in favour of chosen candidates for money, they said.
The Supreme Court, while handing over the investigation to CBI, had also asked it to probe the deaths of people linked to the Vyapam scam.