Forensic significance of condom traces in sexual assault investigations: A systematic review

This systematic review examines the forensic value of condom residue detection in biological samples, particularly in sexual assault investigations where DNA evidence is absent. Following PRISMA 2020 guidelines, a comprehensive literature search was conducted across seven databases (MEDLINE, EMBASE, Cochrane Library, PubMed, Web of Science, SCOPUS, Google Scholar), two trial registers (ClinicalTrials.gov, WHO ICTRP), and four grey literature sources (PQDT, WorldCat, OATD, F1000). Studies published in English from January 1, 2020, to February 28, 2025, were screened using predefined PICO(S) criteria. Eight eligible studies involving human matrices were included. The analytical techniques assessed included DRIFTS-FTIR, ATR-FTIR, Py-GC/MS, GC-MS, and sfPESI-MS. DRIFTS-FTIR demonstrated strong spectral resolution for detecting PDMS-based silicone lubricants, while ATR-FTIR achieved 100 % classification accuracy under controlled laboratory conditions. The combination of spectroscopic and chromatographic techniques (e.g., ATR-FTIR + GC-MS) yielded more reliable and confirmatory results. The risk of bias was assessed using the QUADAS-2 tool for experimental studies and the Joanna Briggs Institute checklist for case reports. Key limitations included small sample sizes, variability in collection protocols, and the lack of validated field methods. Overall, the findings highlight the need for methodological integration and standardisation in forensic lubricant trace analysis. PROSPERO registration: CRD420251004301. No external funding was received.