Section 791(a) in Police Regulations, Bengal , 1943
(a)At the end of the course of instruction at the police Training College all directly appointed cadets who have been declared by the Examination Committee to have passed shall be posted to districts as probationary Sub-Inspectors for a period of two years, during which their career shall be watched with a view to ascertaining whether they are likely to make useful, honest and efficient officers. During this period they shall be trained in the manner described below.
