CID sources told PTI that the strategic position of these districts facilitated rise in illegal cultivation of poppy, which "has become a major fund generating business drawing several hundreds of youths into it".
Apart from Malda district's Ratua, Kaliachak and Baishnabnagar, poppy is also allegedly secretly grown at Nowada and Beldanga in Murshidabad district besides Dubrajpur, Ilambazar and Kankartala in Birbhum district.
"Much evidence is there that the money earned from this cultivation goes to the terror groups through different channels including hawala. The money might have also gone to suspected ISIS agents through JMB," the source said.
"A large number of locals, mainly youth, are involved in cultivating it mostly in areas which are not frequented by locals," he said.
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The district administration with the assistance of the NCB, local police and the BSF had destroyed 4,000 acres of poppy crop last year, whereas around 1,000 acres have been destroyed this year so far, police sources said.
The CID source said that illegal poppy cultivation had
spread to villages on the zero line where the Border Security Force had almost no reach.
According to him, the link between FICN and poppy was helping the growth of terror networks in the state.
The youths involved in illegal poppy cultivation are also being usedin drug-peddling, besides smuggling fake currency.
"On smuggling drugs across the border to Bangladesh one receives fake currency in return... It's actually over the years that Malda has become a major transit of FICN," he said citing a National Investigation Agency (NIA) 2012 report.
He said that earlier farmers in Malda were primarily into producing raw silk yarn and mango, but the easier process of cultivation and the prospect of earning huge money have lured them into cultivating the illegal crop.
"The white latex collected from the opium poppy is the main product for heroin production and the collection of latex is generally done by the children.... Heroin brings in more money for these people," he said.