Bacteria could identify month-old suspicious stains at crime scenes

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    Bacteria could identify month-old suspicious stains at crime scenes


    Health



    13 May 2019

    Trace stains can be difficult to identify

    Trace stains can be difficult to identify

    Rafe Swan/Getty

    By Clare Wilson

    Stains at crime scenes can sometimes be hard to identify, but the unique combination of bacteria they contain may help.

    Large splatters of blood at a crime scene can be self-evident, but investigators sometimes need to work out if tiny stains are significant. “If you see something that looks like a trace, you want to know if it’s important,” says Natasha Arora, of the Zurich Institute of Forensic Medicine in Switzerland.

    Luminol spray can reveal blood spots, but it isn’t a definitive test, as it can cross-react …

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