(a)Every officer of the department deputed to a district or to Calcutta shall carry with him a letter addressed to the Superintendent or the Commissioner of Police, as the case may be, either describing the nature of the enquiry on which he is sent or, in cases where great secrecy is required, authorizing him to explain the object of his mission verbally. In cases in which the officer is not to work in subordination to the Superintendent, the Superintendent will arrange to give him such assistance as may be necessary.(b)Such letters shall be delivered personally, unless the Deputy Inspector-General otherwise directs.(c)Where an officer so deputed has occasion to visit a district, to the Superintendent of which he has not received a letter of introduction, he shall invariably report his arrival to the Superintendent and establish his identity, if required to do so, by means of his detective warrant, or otherwise.
