The investigators should not yield to any pressure from any quarter in the case in which some film personalities are also being questioned, the party said.
The state Excise department on July 2 exposed a racket selling high-end narcotics like LSD and MDMA and has so far arrested 13 persons.
Congress MLA T Ram Mohan Reddy, Deputy Leader of Congress in state Legislative Council P Sudhakar Reddy and other party leaders met RV Chandravadan, Excise Commissioner, and submitted a memorandum to the effect.
Rao on Sunday directed police and excise officials to step up the investigation into the case and not spare anyone.
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The Congress leaders also asked the excise department to conduct counselling for students, who are addicted to drugs, and also their parents.
The film personalities should be "educated" on the menace, they said.
During investigation, it has come to light that students of some high-profile private schools were addicted to drugs.
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