Section 902(d) in Police Regulations, Bengal , 1943
(d)A certificate in B.P. Form No. 167 under the- signature of the Superintendent, shall be given to every officer leaving the service. The actual cause of each officer's leaving the police force, whether discharged at his own request, dismissed or removed for misconduct, discharged as unfit for further service or discharged on reduction, or whatever the cause may be, shall be stated in the certificate.