Telugu actor Tarun appeared before the Special Investigation Team (SIT) probing the Hyderabad drug racket on Saturday.
Accompanied by his father Chakrapani, the actor reached Abkari Bhavan, the office of Prohibition and Excise Department of Telangana at around 10 am.
A team of SIT officials continued questioning Tollywood celebrities for a fourth consecutive day.
Tarun, one of the 12 celebrities to be served notice by SIT, has already denied taking drugs or having links with the accused arrested in the case.
The actor, famous for Nuvve Kavali (2000), had opened a pub in 2009 in Banjara Hills area of Hyderabad. As the role of pubs in drug peddling came under scanner in the past, he had sold his stakes.
After more than 12 hours of interrogation, officials said that a medical team was collecting Tarunâ€™s blood sample, along with samples of his nails and hair, for a forensic test, to establish if the actor had been consuming drugs.
Meanwhile, Excise officials held a meeting with various representatives of pubs and bars in connection with drug abuse, and suspended the license of F-Club in Film Nagar, and issued a warning to 14 other bars and clubs in the city, as some of them had become hubs to consume and sell drugs.
"Pub & Bar owners/Managers of Greater Hyderabad attended a meeting with SIT officials with respect to investigation in these cases. Based on the evidence available, the department has decided to suspend the licence of "F club" with immediate effect. Warning letters have been issued to 14 other bars and pubs," an SIT press release said.
On Firday, investigating officials had interrogated actor Subbaraju for 13 hours. The actor, known for his negative roles in many films, provided leads to SIT for further investigations.
Subbaraju reportedly revealed names of 10 film personalities.
SIT had questioned director Puri Jagannadh on Wednesday and cinematographer Shyam K. Naidu on Thursday.
The celebrities were summoned for questioning as their contact numbers were found in the call data of Calvin Mascrenhas, the kingpin of the racket.
Actors Ravi Teja, Navdeep, and Nandu, actresses Charmee Kaur, Mumaith Khan and art director Chinna are among the other celebrities who will be questioned next week.
The enforcement wing of the department has so far arrested 13 accused, including US citizen Dundu Anish -- an aerospace engineer who had earlier worked with the NASA, and seven B.Tech graduates, most of whom were working for multi-national companies.