Skip to content

    Skin Problems & Treatments Health Center

    Font Size

    Tap Water Leaves Forensic Clue in Hair

    Finding May Help Solve Murder Cases, Researchers Report
    WebMD Health News
    Reviewed by Louise Chang, MD

    Feb. 25, 2008 -- Your hair may reveal where in the U.S. you live. Tap water leaves telltale clues about regions, new forensic research shows.

    Scientists have developed a test that predicts where in the U.S. a person lives based on traces of hydrogen and oxygen in hair samples.

    "Police are already using this to reconstruct the possible origins of unidentified murder victims," University of Utah biologist James Ehleringer, PhD, says in a news release.

    Ehleringer's team collected hair samples from barbershops in 65 U.S. cities. They also collected samples of local tap water.

    Levels of hydrogen and oxygen in the hair samples were in sync with traces of hydrogen and oxygen in local tap water. "We have found significant variations in hydrogen and oxygen isotopes in hair and water that relate to where a person lives in the United States," says Ehleringer.

    The researchers considered the fact that some people may drink bottled water which came from another part of the country, and the fact that people don't just eat locally grown foods. The test still worked.

    The test may also prove useful for gathering dietary information, note Ehleringer and colleagues.

    Their findings appear in the Feb. 26, 2008 edition of Proceedings of the National Academy of Sciences.

    Today on WebMD

    Pictures and symptoms of the red, scaly rash.
    woman with dyed dark hair
    What it says about your health.
    woman with cleaning products
    Top causes of the itch that rashes.
    atopic dermatitus
    Identify and treat common skin problems.
    itchy skin
    shingles rash on skin
    woman with skin tag
    Woman washing face
    woman washing her hair in sink
    close up of womans bare neck
    woman with face cream