Bro, focused? They were bloody happy with it. When have they cared? I was in school those days and dad was posted near NJP, there were officers sent purposefully by the Bengal and Bihar government (civil administrators) who would facilitate these activities- all knowing very well that these are Bangladeshis(even wired fencing was no done purposefully, and a 2 jawan party was supposed to manually patrol a long stretch of land without any posts, on foot). Mr Sushasan from Bihar and Mr Communist from Bengal made sure that these activities take place with ease. BSF(earlier SSB too was there) guys would be pulled in fake FIRs every now and then by the local police to keep them pressurised to stay away from this business. All of this happened with their active participation, it serves their purpose