Witness 24: Tanvir Hasan Zoha
Testimony of Tanvir Hasan Zoha.
I am Tanvir Hasan Zoha, currently working as a Prosecutor, Digital Forensic Expert, and Special
Investigating Officer at the International Crimes Tribunal, Bangladesh.
Regarding the Abu Sayed murder case, in the CCTV footage from Begum Rokeya University, the “in and out” time of the incident is seen as 2:45 PM. On the other hand, in the video footage broadcast by NTV, the time is seen as 2:17 PM. To determine the correct timing, Investigating Officer Ruhul Amin consulted with me. Since the CCTV’s internal clock was not calibrated according to Bangladesh Standard Time, and because NTV’s internal clock was calibrated according to Bangladesh Standard Time using the same method, and because NTV’s router—a portable TP-Link 4G LTE Mobile Wi-Fi (Model M7310), bearing IMEI number 86977020801181 and MAC Address 70-8B-CD-E9-B3-28—was being operated and controlled with a Micro SIM card inside the device (Operator Robi, ICCID), SIM number 8801866568715 and a MicroSD memory card, the time of the murder is calculated as correct at 2:17 PM.
This is my deposition.
Cross-examination by Defense Counsel Aminul Ghoni Titu representing Accused no. 10-Md. Shoriful Islam
Defense: Where did you study digital forensics?
Witness: I completed a certificate course in CEH.
Witness (Voluntarily stated): Currently, I am working as a Certified Forensic Examiner at two universities, namely National University and Daffodil International University.
Defense: What is the full form of CEH?
Witness: Certified Ethical Hacking.
Defense: Where is this institution?
Witness: I studied this subject online.
Defense: Who issued your certificate?
Witness: The Global Authority of CEH.
Defense: When and where did you consult with Ruhul Amin?
Witness: The Investigating Officer of this case, Ruhul Amin, consulted with me in November
2024, but I do not remember the date.
Defense: Did you perform a forensic examination of the SIM card?
Witness: I did not; I collected preliminary information.
Witness: The Investigating Officer did not ask for any written consultation from me. I gave a report to the Investigating Officer. The digital methods that I adopted are mentioned in the report.
Defense: When did you submit the report?
Witness: 22/06/2025.
Witness: I submitted the report seven months after the consultation.
Witness (Voluntarily stated): However, I reached the conclusion in November 2024. The fact that the decision was reached in November is not mentioned in the report. I did not submit the report dated 22/06/2024 to the Tribunal. It is not true that I submitted the report according to the
dictates of the Investigating Officer. It is not true that I lack the institutional education required to be a digital forensic expert.
Defense Lawyer Azizur Rahman Dulu Representing Accused no. 8-Amir Hossain, 9-Sujan Chandra Roy adopted the cross examination conducted by Aminul Ghoni Titu (cross
examination 10)
Defense Counsel Sheikh Mustabhi Hassan representing Accused no. 13-Rafiul Hasan Rasel adopted cross-examination 10.
State Defense Lawyer Md.Salauddin representing Accused no. 23 and 29, adopted cross- examination 10.
State Defense Lawyer Mamun-Ur-Rashid representing absconding Accused no. 16-Pomel Barua,
17-22, 24 adopted cross-examination 10.
State Defense Lawyer Md. Shahidul Islam representing absconding Accused no. 15-Amin Hossain, 25, 26, 27 and 28 adopted cross-examination 10.
State Defense Lawyer, Sujat Mia representing absconding Accused no. 1-Prof. Hasibur Rahman, 11-Hafizur Rahman, 12-Sarwar Hossain, 14 and 30, adopted cross-examination 10.
State Defense Lawyer, Israt Ony, appearing for accused numbers 2 to 7, adopted cross-
examination 10.
Next Date: 17 December 2025.