The long stretches of the porous Indo-Nepal border in Darjeeling Districts’ Siliguri has often been usedas an escape route by law evaders. So when Chandana Chakraborty, who ran an ' adoption agency' in the area, named a BJP leader during interrogation after her arrest last week in connection with a child trafficking racket, intelligence officers of the CID-- West Bengal Police's investigating department-- took up position along this border.