Documentary evidence from designated mint and forensic officers is admissible though the reporting officer need not be called as witness. Reports signed by designated gazetted officers of Mints, Note Printing Presses, Security Printing Presses, specified Forensic Departments or Examiners of Questioned Documents are admissible as documentary evidence in proceedings under the Sanhita even if the officer is not called as a witness. The court may summon the officer regarding the report but cannot compel production of the records underlying the report. An officer cannot be required, without permission of the head of the institution, to give evidence from unpublished official records or disclose the particulars of tests used in the examination.