Forensic Science in Criminal Justice

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Forensic science encompasses a broad range of scientific disciplines applied to legal contexts, providing investigators and courts with objective, evidence-based information that can establish facts surrounding criminal events. The field gained widespread recognition in the nineteenth century through the pioneering work of figures such as Alphonse Bertillon, who developed systematic anthropometric identification methods, and Francis Galton, whose research established the uniqueness of fingerprints and laid the foundation for modern dactyloscopy. Subsequent decades witnessed the development of blood typing, ballistics analysis, toxicology, and document examination as standard forensic tools. The most transformative advance arrived in 1984 when British geneticist Alec Jeffreys developed DNA profiling, a technique that revolutionised the capacity of investigators to link biological material recovered from crime scenes to specific individuals with extraordinary statistical precision. DNA evidence has since exonerated hundreds of wrongfully convicted individuals, particularly in the United States through organisations such as the Innocence Project, revealing systemic flaws in earlier conviction practices. Despite its power, forensic science is not infallible, and high-profile miscarriages of justice have prompted scrutiny of disciplines such as bite mark analysis, hair comparison, and arson investigation, many of which lack the rigorous empirical validation applied to DNA techniques, leading to calls for standardised accreditation and independent oversight of forensic laboratories.