Eleven cases have been registered since the racket was detected on July 2 by the department's Special Investigation Team (SIT) with the arrest of three persons.
A total of 22 people were arrested, including US citizen Dundu Anish, a former aerospace engineer who has worked with the NASA, Dutch national Mike Kamminga, South African national Alex Victor, besides seven BTech degree-holders employed with multi-national companies here.
"We had a series of meetings with our legal advisers and public prosecutors also... My assessment is that we should start filing charge sheets from September end," Sabharwal told PTI.
"Keeping in view the forensic science reports on body fluid samples (which are awaited)...We expect (by) September end to mid-December on filing of charge sheets in all the cases," he said.
The majority of documentation work is done. "Laptops and cell phones (which were seized from arrested accused) analysis is also being done," Sabharwal said.
The SIT has questioned around 100 people, including Telugu film personalities, in connection with the racket of supplying high-end drugs such as lysergic acid diethylamide (LSD) and methylenedioxy-methamphetamine (MDMA).
On notices issued to a few IT firms, Sabharwal said, "We informed certain companies. We are calling people (for questioning) based on substantial evidence."
After the names of some members of film industry had cropped up during grilling of the arrested accused, the SIT summoned them under relevant sections of Narcotic Drugs and Psychotropic Substances (NDPS) Act.
The SIT questioned them to find out if they had any links with the racket as consumers or suppliers, or with those arrested.
LSD is sold in tablets or in liquid form, and is known to be one of the most potent 'mood-changing' chemicals, while MDMA, commonly known as 'Molly' or 'Ecstasy', is used as a recreational or party drug.
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, SIT officials had said.
"Things kept on growing from there and the whole thing broke out after one of my officers was attacked," he said.
"I personally feel the job that we had set ourselves out for has been achieved in a great measure," Sabharwal said.
"We need to understand as a society that we need to shun drugs and not addicts, and everybody needs to be clear about it that it is the drugs we are against and not addicts, and there has to be a fine balance between punishment and reform," he said.
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