WATCH: Berkeley Scientist Caught on Video Poisoning Female Co-Worker

A chemical engineer in California was caught on video poisoning his female co-worker.

David Xu, 41, a scientist at Berkeley Engineering and Research, had secretly been poisoning his colleague, Rong Yuan, with cadmium for nearly two years.

Cadmium is a toxic heavy metal. Yuan had suffered vomiting and hair loss for two years before discovering that her co-worker was poiso...