Kindly refer to the section 56 of Criminal Procedure Code which talks about person arrested to be produced before a Magistrate or a Police Incharge in the Police Station this section is further strengthened with Section 57 which speaks about the period of 24 hours within which the person needs to be produced before the Magistrate. Otherwise the police in case of inter state case resorts to transit remand from the Magistrate having appropriate jurisdiction. Hope this clarifies.
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Yes, it ismandatory & there is a mandatory diary entry/ DD Entry which u can ask thru RTI fro MHA (mention the name of all such states involved, all dates, FIR No. & other important details) with 48 hours clause