Trace DNA, also known as “low copy number DNA” or “touch DNA,” refers to small amounts of DNA left on objects. While trace DNA detection techniques have continued to improve as scientists have become aware of the ability of DNA to be transferred between objects, the precise of origin of materials composing trace DNA is not currently well understood.
Since 2018, the NIJ Forensic Science Research and Development Technology Working Group called for comprehensive, systematic, well-controlled studies that provide both foundational knowledge and practical data about DNA transfer and persistence. To address this knowledge gap, NIJ has supported multiple projects focused on trace DNA analysis.
Each month, NIJ features a term from our scientific portfolios related to justice system issues and solutions, highlighting select NIJ reading and resources.
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