Maintaining the chain of custody: Anti-contamination measures for trace DNA evidence

Abstract

Trace DNA evidence has become an essential tool in forensic investigations, but its reliability is dependent on strict adherence to protocols and procedures that ensure the integrity of the evidence is preserved throughout the investigation. Maintaining a clear chain of custody is critical to the admissibility of evidence in court, and its absence can result in the exclusion of evidence or even a mistrial being declared. Contamination is a significant issue when collecting DNA evidence at a crime scene, and anti-contamination measures must be taken to ensure the reliability and accuracy of the evidence. The use of technology, such as electronic chain of custody (eCOC), automated DNA extraction systems, real-time PCR analysis, DNA profiling software, and environmental monitoring systems, can enhance the accuracy and reliability of evidence. Law enforcement agencies and forensic labs must establish strict guidelines for the collection, preservation, and analysis of trace DNA evidence to maintain its integrity and admissibility in court.