Instead of using barbed wire or an alarm system to scare away burglars, one doctor in the Federal District of Brasilia, Brazil, installed a row of needles tainted with HIV-positive blood on top of an outer wall of her home, Fox News Latino reports. She also posted a cardboard sign that read, “Wall with HIV-positive Blood. Do Not Jump,” according to TV Globo in Brazil—the doctor’s identity was not revealed. USAID estimates that a third of all HIV-positive people in Latin America live in Brazil.

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