MUMBAI, Feb. 1 -- The Mumbai unit of the Central Bureau of Investigation (CBI) has arrested a Customs officer in a corruption case. The officer, Vineet Dhattarwal, has been accused of demanding an undue advantage of Rs.4 lakh for clearing an import consignment. The CBI case was registered on November 21 last year based on a complaint from a representative of a firm based in Vadodara, Gujarat, which is in the business of chemical imports. According to the complaint, the Customs officer had allegedly demanded an undue advantage of Rs.5 lakh, which was reduced to Rs.4 lakh after negotiations, for facilitating the clearance of an import consignment comprising a chemical product (Toluene Diisocyanate) that arrived from the Jebel Ali Port, Dubai, United Arab Emirates....