The 37 Scientific Evidence of Digital Evidence Tampering on CCTV Footage at Olivier Café: The Jessica Kumala Wongso Case (2016), Carried Out by Muhammad Nuh Al-Azhar and Christopher Hariman Rianto, Who were Under the Leadership of the General Crime Director of the Jakarta Metropolitan Police, Krishna Murti, and the Chief of the Jakarta Metropolitan Police, Tito Karnavian.
EVIDENCE 12:
CCTV 9 FOOTAGE FROM 15:35 TO 16:59 LOCAL TIME FRAME DIMENSIONS WAS REDUCED TO 960x576 PIXELS FROM 1920x1080 PIXELS AND FRAME RATE WAS REDUCED TO 10 FPS FROM 25 FPS
The CCTV 9 footage was deliberately downscaled from its original resolution of 1920x1080 pixels to 960x576 pixels, along with the reduction of the frame rate from 25 frames per second to 10 frames per second, had profound forensic impacts on the investigation of the events at Café Olivier on January 6, 2016. This manipulation, performed by digital forensic experts Muhammad Nuh Al-Azhar and Christopher Hariman Rianto, significantly compromised the ability to analyze critical visual evidence.
One of the most crucial aspects affected by this downscaling was the analysis of the coffee served by Agus Triono to table 54. The original high-resolution footage would have allowed for a detailed comparison of the coffee’s color at the time it was served and after it was allegedly tampered with. Toxicologists Nursamran Subandi and I Made Agus Gelgel hypothesized that the coffee containing cyanide would appear darker than a normal cup of coffee served at Café Olivier. This hypothesis could have been verified by examining the color difference in the high-resolution footage. However, the downscaling blurred the details, making it difficult to discern the subtle color differences that are critical for such an analysis.
In addition to the color analysis, the downscaling also obscured the physiological responses of Mirna Salihin. As she was being wheeled out of the café in a wheelchair, forensic doctors would have been able to analyze her physical state in high detail, noting any signs of distress or specific physiological reactions. These details are crucial in understanding her condition post-ingestion of the alleged cyanide-laced coffee. The lower resolution and reduced frame rate, however, resulted in a loss of important visual cues that could have provided insights into her symptoms and overall physical response.
The manipulated footage also played a significant role in the accusations against Jessica Wongso. According to the interrogation report (BAP - Berita Acara Pemeriksaan) of Muhammad Nuh Al-Azhar, the dimensions of the footage should have remained at 1920x1080 pixels. By reducing the resolution, the forensic analysis of Jessica Wongso's actions became flawed. Muhammad Nuh Al-Azhar alleged that Jessica scratched her right thigh and fingers, actions purportedly indicative of cyanide residue. The reduced resolution made it challenging to accurately interpret these gestures, leading to potentially erroneous con
