biological sciences. It explains the nature of blood as physical evidence, the methods of collecting and preserving it, and the importance of respecting the chain of custody to ensure its integrity. It also presents analytical techniques, particularly DNA testing, and their role in linking a suspect to the crime scene or excluding them. The article discusses the legal value of blood evidence and its limitations related to the possibility of contamination or error. It concludes that such evidence gains probative force only when integrated with other evidence and assessed by the court, emphasizing the importance of technical expertise and judicial certainty.
asma khelifi (Tue,) studied this question.