She Secretly Filmed Her Coworker Poisoning Her

A hidden surveillance camera captured engineer David Xu pouring a substance from a small white container into the water bottle of his coworker, Dr. Rong Yuan, at their workplace in Berkeley, California. About 30 seconds later, he returned, turned the bottle to its original position, and walked away. According to the Berkeley Police Department's investigation, Xu had repeatedly contaminated Yuan's food and drinking water with cadmium, a toxic heavy metal, for more than a year. (Video courtesy of Dr. Rong Yuan.)