Meanwhile, there were reports that a hair sample of the accused, sent for analysis, was returned and that it would affect the investigation.
The CBI on Saturday conducted polygraph tests on Vishnu Somasundaram and Kalabhavan Sobi in connection with the probe into the death of violinist Balabhaskar.
Sources said CBI decided to conduct the test after noticing contradiction in the statements of the musician’s ex-associates and the witness.
“Two friends of the social activist will also be asked to undergo polygraph test at SFSL,” said a senior Crime Branch officer.
Senior CBI officials disclosed that the decision for NARCO test was taken in the wake of the contradiction in answers given by the MLA to similar set of questions posed to him during the grilling