“…Particularly one application of microbiome forensics, the analysis of biological stains, has witnessed much progress in recent years and may soon be ready for integration in forensic laboratories. The microbes in such samples, typically traces, may reveal information on who was involved, through the identification of the donor(s); the nature of the activities that took place (what), through the examination of the type of cellular material (eg vaginal, oral, skin, saliva); and the time of occurrence (when), through estimation of the time of stain deposition (Figure 1) (7).…”