The CBI has decided to conduct forensic psychological assessment of the nine persons arrested in connection with the killings in Birbhum district of West Bengal, an officer said on Saturday. During the assessments, one psychologist will be present to note their body language as well as facing expressions, which will be treated as evidence, he said.

from Times of India https://timesofindia.indiatimes.com/city/kolkata/birbhum-killings-cbi-to-conduct-forensic-psychological-assessment-of-9-arrested/articleshow/90608176.cms