MUMBAI, July 29 -- In a Rs.381 crore Mephedrone (MD) bust, the Sakinaka police have arrested four people and seized 187kg of the synthetic stimulant and its raw materials from a drug manufacturing unit in Mysuru, Karnataka, on Friday. The unit was a key supplier in Mumbai's MD racket, and was exposed thanks to a lead from a drug peddler in Vasai. According to the police, they have seized MD worth Rs.390 crore in the past three months. The long-drawn investigation began in April this year when the Sakinaka police arrested three people who were selling drugs in the Kaman area of Vasai east. At the time, the police had seized MD weighing 4 kg 53 grams and worth Rs.8 crore. The main accused in the case, Salim Sheikh alias Salim Langda, 45, was absconding but the police formed a special team and arrested Langda from Bandra Reclamation on April 24. Police said that Salim Langada confessed that he was getting MD from a factory in Mysuru in Karnataka. The police then followed the lead and found an MD-making factory operating in a shed covered with blue plastic sheets, not far from the Ring Road in Mysore city. The police raided the shed and seized 187 kg of MD as well as ovens, beakers and chemicals like alcohol, chloroform, magnesium sulphate and acetone used to make MD and other drugs. Deputy commissioner of police, Zone 10, Datta Nalawade, said that four people have been arrested from the factory and police are now trying to find the source of the raw materials and the role of the four accused....