How is the involvement of CBI in the Kolkata doctor rape and murder case impacting the investigation process

- The involvement of CBI in the Kolkata doctor rape and murder case has brought a new perspective and expertise to the investigation process. - CBI being allowed to conduct polygraph tests on key suspects like the ex-principal of R.G. Kar Medical College and 4 other doctors can help in uncovering vital information and identifying any discrepancies in their statements. - Polygraph tests can provide valuable insights into the possible involvement or knowledge of the suspects in the crime. - The results of the polygraph tests can help CBI in corroborating evidence, narrowing down suspects, and building a stronger case against the perpetrators. - Overall, CBI's involvement and the use of polygraph tests can potentially accelerate the investigation process and bring justice to the victim.