The driver was among the 12 personalities, including directors and actors from the Telugu film industry, summoned by the special investigation team (SIT) which is questioning several people as part of cases registered in connection with the racket.
The SIT had yesterday grilled Mr Teja for about 10 hours in connection with the case.
Mr Teja has acted in several movies directed by Puri Jagannadh, who was the first person from the Telgu film industry to be recently questioned.
Since July 19, the SIT has questioned cinematographer Shyam K Naidu, actors P Subba Raju, Tarun Kumar and P Navdeep, actresses Charmi Kaur and Mumaith Khan, and art director Dharma Rao alias Chinna.
The investigators suspect that film personalities, employees of MNCs, school and college students were among the clients.
The racketeers placed orders through 'Darknet' (a restricted online network frequently used in illegal activities) and the drugs were delivered by couriers, including from overseas, the officials had said.