Mumbai, Feb. 10 -- In three different cases, the Mumbai Customs department seized over 4.40 kg of heroin and 4.5 kg of cocaine worth around Rs.75.20 crore in January this year. In addition to seizing narcotic drugs, the officials also confiscated smuggled gold worth around Rs.42 crore and Rs.3.47 crore of foreign currencies. Customs sources said this is for the first time that they are witnessing such a huge seizure of drugs, gold and foreign currency together in just a month. According to sources, drug cartels are now finding new and clever ways to smuggle narcotics and psychotropic substances across countries. However, customs officials managed to successfully foil their plans several times and exposed their modus operandi. "Last month, drugs were smuggled in cloth buttons and in false cavities of duffle bags," said a customs source. Early this year, the Air Intelligence Unit (AIU) of the Mumbai Customs arrested a Hyderabad resident for allegedly smuggling in 4.5kg of heroin worth Rs.22 crore via air route....