Section 633(a) in Police Regulations, Bengal , 1943
(a)When a case occurs in a district in which the modus operandi shows any interesting peculiarity or novelty or indicates that any of the classes of criminals mentioned in Appendix XXXII or any other known class of itinerant professional criminal is concerned and the accused is unknown or has absconded after committing the offence, the investigating officer shall make a reference to the Criminal Intelligence Bureau in B.P.
