Vyapam scam accused Ramesh Shivhare's police custody was extended for two more days on Wednesday.
A joint team of the Central Bureau of Investigation (CBI) and the Uttar Pradesh Special Task Force (UPSTF) arrested Ramesh Shivhare alias Chandra, one of the main accused in the multi-crore scam, on May 5.
The CBI took over the Madhya Pradesh Professional Examination Board, abbreviated in Hindi as Vyapam, investigation in July 2015 after dozens of accused, beneficiaries, whistle-blowers and witnesses died mysteriously.
A notice of non-bailable warrant (NBW) and attachment of property had also been issued against him.
Shivhare and his friends started the racket to help candidates rig examinations for money by employing imposters to write test papers, manipulating seating arrangements and supplying forged answer sheets after the coaching institute he ran with a close friend closed down in 2007.
They began operating in Uttar Pradesh, Rajasthan and Madhya Pradesh, where they charged exorbitant fees for seats in medical and engineering colleges.
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Similarly, they also connived with doctors and engineers to solve question papers.
More than 2,000 people have been arrested in connection with the scam, where organised rackets allegedly rigged tests conducted by the MPPEB for admissions to various courses and recruitment for government jobs.