The forensic test in which MLA Anant Singh's voice tested positive was conducted to ascertain whether he was in touch with alleged attackers planning a murderous assault on a local contractor.
Controversial Independent MLA Anant Singh had surrendered before a Delhi court last week after dodging the Bihar Police for several days.
The four-time MLA surrendered at Saket court in Delhi after escaping from his official residence in Patna on August 17 after an AK-47 rifle with ammunition was recovered from his residence.
Singh, who was on the run since an AK-47 rifle and grenade was recovered from his ancestral home on August 16, had appeared before Saket Court Metropolitan Magistrate Harun Pratap on Friday
The Bihar police lodged a case against him under the Unlawful Activities (Prevention) Act and Arms and Explosives Act
He was wanted in the case related to the recovery of an AK 47 rifle and ammunition from his ancestoral house at Ladma.
Anant Singh has been absconding since last Saturday after he was booked following the recovery of an AK-47 from his house.
In a letter written to the Director-General of Police, Amitabh Kumar has sought police protection claiming a threat to his life.
The look-out notice after being issued will be sent to all the airports to detain Anant Singh if he tries to escape from the country.
The SP said the raids were carried out in the presence of a magistrate and the caretaker, in accordance with the law.
He alleged that the AK 47 was planted in his house under a well-engineered conspiracy to prevent him from contesting the forthcoming assembly elections from Mokama.
A team of FSL-cum-bomb disposal experts was summoned from Patna to take details of the recovery and defuse some of the bombs that were found with the assault rifle.
State president of Congress party Madan Mohan Jha told the media that Singh was being targeted out of political vendetta without proper investigation.
Suspecting a conspiracy to eliminate him along with wife, Singh alleged the incident as a party conspiracy to eliminate him.
Anant Singh, who is an independent MLA from Mokama, has expressed his desire to contest Lok Sabha elections on a Congress ticket although he is yet to be inducted into the party.