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 14: CCTV 2 FOOTAGE DELIBERATELY CONVERTED FROM COLOR TO GRAYSCALE
CCTV 2 footage was divided into two parts: the first part from 13:55 WIB to 16:02 local time (as per the Examination Report of Muhammad Nuh Al-Azhar) and the second part from 16:02 to 18:06 local time (as per the Examination Report of Christopher Hariman Rianto). Metadata analysis of both parts of CCTV 2 footage shows that the video has three color channels (YUV color space), indicating that CCTV 2 footage is a color video. However, when displayed in court by Christopher Hariman Rianto, Muhammad Nuh Al-Azhar, and the prosecutor, the video turned into grayscale (only one channel). This confirms that CCTV 2 footage was deliberately converted from YUV color space to grayscale.
The forensic impact of this manipulation is very significant. The color information captured by camera 2 is crucial to provide details about the volume and color of the remaining coffee glass carried by Devi Siagian from the pantry to the cocktail bar. The color of the coffee glass should indicate whether there was any color change alleged to be caused by contamination or a harmful substance such as cyanide. This vital information was destroyed by Muhammad Nuh Al-Azhar and Christopher Hariman Rianto.
Furthermore, the color information of Mirna Salihin's face and arms when she was taken in a wheelchair from table 54 out of the Olivier café around 17:28 local time should have been carefully analyzed. Skin color can show physical signs such as paleness or other color changes that might indicate certain medical conditions due to poisoning. This vital information was also deliberately destroyed by Muhammad Nuh Al-Azhar and Christopher Hariman Rianto.
This video manipulation removes crucial visual evidence. The removal of color information by digital forensic experts, who should maintain the integrity of every bit of information in this video, demonstrates a serious breach of professional ethics. This manipulation not only obscures the truth of the events that occurred but also undermines trust in the forensic analysis results presented in court.
Manipulating the video from color to grayscale also casts a shadow over the credibility of the forensic experts involved. Forensic experts are expected to uphold the highest standards of integrity and ensure that the evidence they present is as accurate and unaltered as possible. The deliberate conversion of the video from its original color format to grayscale is a serious breach of these professional ethics. It suggests an intention to obscure or manipulate the evidence, which can severely da
