On a day when the CID announced that former CPM minister Sushanta Ghosh may have to take a polygraph test, sleuths recovered a cache of ammunition from his ancestral house in Benachapra, West Midnapore.
"We found 17 rounds of 7.65 mm live cartridges, eight loaded pistol magazines, one ammunition pouch and five 303 ammunition chargers from under the bed of Ghosh's brother Prashanta," said a CID sleuth.
"We will appeal before the court for a polygraph test if Ghosh does not cooperate with us," said K Jayaraman, DIG-CID (Operation), on Saturday.
On the second day of Ghosh's interrogation at the CID headquarters, Bhawani Bhavan, DG-CID VV Thambi said: "He is not cooperating with us."
If this happens it will be the first instance in the state of a politician being subjected to a polygraph test.
The test, however, cannot be forced on to any accused.
"The consent of the accused, apart from a permission by the court, is needed for conducting a polygraph test," said Chandranath Bhatterjee, director, Central Forensic Science Laboratory (CFSL), Kolkata.
The polygraph test maps different indicators such as blood pressure and heartbeat to find out if the accused is lying.
Sleuths raided two other houses of Ghosh on Saturday - one in Chandrakona and another in South Kolkata.
"We have got leads about certain leaders involved in the case, but we cannot reveal their names for the sake of investigation," said Jayaraman.
Ghosh was arrested after a Midnapore court rejected his plea for extension of anticipatory bail.
The court action came after a report by the CID said the DNA of two out of the seven skeletons, dug from behind Ghosh's residence in June, matched those of the two missing Trinamool supporters, Ajoy Acharya and Raju Sinha.
CPM leaders have already announced that the party will stand by Ghosh, an MLA since 1987 and minister for 16 years.