The Bidhannagar Court authorized the CID to collect a voice sample from TMC MP Abhishek Banerjee.
The recording procedure is officially scheduled to take place on June 30 in the presence of a judge and forensic experts.
The investigation centers on allegations of a provocative speech delivered by the leader during the Assembly Election campaign.
Abhishek Banerjee is required to remain physically present at the court to facilitate the forensic evidence collection.