MUMBAI, June 11 -- A 43-year-old MSc Chemistry graduate was arrested on Tuesday for manufacturing mephedrone at a chemical factory in Boisar, where he was employed as a chemical engineer. The accused is identified as Vijay Katke. On a weekend when there were no workers in the factory, he experimented with producing mephedrone and was successful. He then began manufacturing the drug regularly on weekends, said a police officer. On Tuesday, the police raided the factory and seized mephedrone worth Rs.11.2 lakh. The act came into light last week when the police caught Farhan Khan, a Jogeshwari resident, with 71 grams of mephedrone worth Rs.2.8 lakh and arrested him. On being questioned, Khan told the police that a cab driver, Pratik Jadhav, delivered the drugs to him. Following the lead, the police tracked down Jadhav. During interrogation, he told the police that he obtained the drugs from Katke and revealed the address of the factory where Katke had been manufacturing the drug. The police then raided the factory and arrested Katke....