Naidu is among 12 Tollywood personalities, including actors, directors and producers, against whom the department had last week issued notices under relevant sections of the Narcotic Drugs and Psychotropic Substances (NDPS) Act, asking them to appear before its special investigation team (SIT).
SIT sleuths had yesterday grilled noted film director Puri Jagannadh for around 10 hours in connection with the cases registered after it busted the racket on July 2.
They said the "Pokiri" director gave "certain clues" in connection with the racket and his blood sample was also taken.
Later, in a video message posted on his Twitter handle last night, Jagannadh said he had no links with Calvin Mascarenhas, a key accused arrested in the case, or his gang members and that he never met them.
"I do not indulge any illegal activity. I respect the police and I have done many films on the police department. I personally know some journalists. I feel bad because some of them showed me in a bad light in their TV programmes without knowing the facts and ruined our lives," he said in the video message.
Among the 13 people arrested so far in connection with the racket is a US citizen, identified as Dundu Anish, a former aerospace engineer who had worked with NASA, and seven BTech graduates, most of whom were working with multi-national companies here.
Names of some Tollywood personalities cropped up during the interrogation of the arrested people, the excise officials had earlier said, adding the focus of their investigation will be on whether they (to whom the notices were issued) were drug users, peddlers or suppliers.
In some cases, drugs were sent to them through courier from foreign countries.
The SIT has asked officials of three major courier firms to come and meet them in connection with the probe into these cases.
A letter has also been addressed to the chief post master general requesting support from the postal department.
LSD, sold as tablets and liquid, is known to be one of the most potent mood-changing chemicals, while MDMA, commonly referred to as molly or ecstasy, is a popular recreational or party drug.
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