The Drone Files

On an overcast day in December, a drone flew over the outskirts of Dallas. The brief flight had been routine­—a test to calibrate equipment—so the amateur pilot wasn’t expecting much when he returned home to review the pictures he had captured. But something in the bottom left-hand corner of one of the photos caught his eye. It looked like a river of blood flowing from the back of a factory into a creek that fed the Trinity River.

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