Microbial evidence is crucial in forensic science for creating unique "fingerprints" from the bacteria, fungi, and viruses left behind by individuals, linking suspects to crime scenes or victims through their distinct microbiomes, and helping to establish timelines (PMI) or locations of death using postmortem microbial changes, complementing traditional DNA evidence and providing new leads in cases with limited DNA. This field, known as microbial forensics, analyzes these invisible traces to identify individuals, attribute biological attacks, and even link victims and perpetrators years after an event, using advanced DNA sequencing like metagenomics.  

Key Applications in Forensics: 

• Individual Identification: Each person's unique skin and surface microbes can link them to objects (phones, weapons, clothing) or locations, acting like fingerprints. 
• Linking Suspects & Victims: Comparing microbial communities on a suspect's belongings to those at a crime scene helps establish presence. 
• Postmortem Interval (PMI): The changing microbial community on a body after death (thanatomicrobiome) provides clues about the time and place of death (e.g., aquatic microbes for drowning). 
• Attribution: Analyzing microbial communities in biological attacks (bioterrorism, bio crimes) helps determine the source and perpetrator. 
• Geographic Profiling: Human-associated microbiomes can sometimes reveal geographic origins or locations where a person has traveled.