contradicts witness testimony, identifies the perpetrator(s), provides investigative leads, sheds light on the perpetrator's methods (modus operandi), and demonstrates that a crime has occurred.33 iii. Digital Evidence Consideration In this phase, the integrity of digital evidence is assessed by scrutinizing the digital forensics procedures and tools utilized in obtaining the evidence, as well as the competence and qualifications of the digital forensics experts involved in its acquisition, preservation, and analysis. This evaluation aims to ensure that scientific principles were adhered to in the preservation, acquisition, and analysis of digital evidence, and that standards were met in handling and examining it. Digital forensics experts present testimony in court to elucidate their qualifications, explain the workings of digital devices and ICT-related sources, outline the digital forensics process, justify the selection of specific digital forensics tools, describe how digital evidence was preserved, acquired, and analyzed, interpret the findings of analyses, assess the accuracy of these interpretations, and account for any alterations to the data and their reasons. The qualifications of digital forensics experts are also scrutinized to confirm the competency of individuals handling and analyzing digital evidence. This competency is crucial to ensure the quality of work products and install confidence in the results produced. While there are no universal competency standards for digital forensics experts, their qualifications vary by country, and certification may or may not be required depending on the jurisdiction. This phase evaluates whether experts possess the necessary qualifications to act as expert witnesses and/or conduct examinations of ICT and ICTrelated data, and whether their competency has been verified and tested.34 iv. Digital Evidence Determination In this phase, the authenticity, integrity, and reliability of digital evidence are evaluated based on the assessment conducted in the previous phase. This includes verifying the use of forensically sound methods and tools and relying on expert testimony to confirm the evidence's credibility. Admissible digital evidence must establish relevant facts, remain unchanged throughout the forensic process, and be supported by valid, peer-reviewed results. It's essential that interpretations of findings are unbiased, with any errors or limitations disclosed. Overall, this three-phase model harmonizes legal and technical 33 34 US National Institute of Justice; 2004a; Maras, 2014 Brezinski and Killalea, 2002; US National Institute of Justice, 2004a; European Network of Forensic Science Institute, 2015 23

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