Section 311 in The Code Of Criminal Procedure, 1973
Section 311 of CRPC “Power to summon material witness, or examine Person Present”
Any Court may, at any stage of any inquiry trial or other proceedings under this Code summon any person as a witness or examine any person in attendance though not summoned as a witness or recall and re-examine any person already examined and the Court shall summon and examine or recall and re-examine any such person if his evidence appears to it to be essential to the just decision of the case.