- all held during 2012 for government jobs in the state. For Pre-PG Test of 2012, MPPEB's former examination controller Dr Pankaj Trivedi and its system analyst Nitin Mahindra provided model answer keys to candidates through photocopies. For the other four exams, the Vyapam officials manipulated the OMR answer sheets by taking them out of the strong room. Different FIRs against 153 people, including Sudhir Sharma, were filed. Sharma had earlier been interrogated by CBI in mining scam of Madhya Pradesh. In March 2014, the government announced that the STF was investigating rigging of nine examinations, and 127 people had been arrested. The previous years' PMT exams were also investigated. The STF found that 286 candidates had cleared PMT-2012 through fraudulent means. On 29 April 2014, 27 students of MGM Medical College in Indore were expelled for having used fraudulent means to clear PMT-2012. In June 2014, the High Court asked the police why several of the accused in the case had not been arrested yet. Following this, the STF made several arrests. On 15 June, the STF arrested the state's former technical education minister and BJP leader Laxmikant Sharma for his alleged involvement in the contractual teachers recruitment scam. On 18 and 19 June 2014, the police arrested over 100 medical students from different parts of the state, for their involvement in the PMT scam. In September 2014, the STF revealed that Jagdish Sagar's racket had also rigged the entrance exams for recruitment in SBI and other nationalized banks. These entrance exams included the Institute of Banking Personnel Selection's exams and the SBI Probationary Officer's exam. Investigations Initial investigations into the irregularities were conducted by the various city units of the state police. During 2009-11, a committee established by the state government and headed by the State Joint Director of Medical Education, probed the irregularities in the PMT exam. After the role of organized crime rackets and politicians in the scam came to light, the state government formed a Special Task Force (STF) of the police on 26 August 2013, to investigate the scam. Several activists and politicians, including members of the major opposition Indian National Congress party, demanded a CBI probe in the scam under the supervision of the Supreme Court of India. Chief Minister of Madhya Pradesh, Shivraj Singh Chouhan did not entertain the suggestion of a CBI inquiry to the probe initially. On 5 November 2014,