A Berkeley engineer who says she was poisoned for more than a year is releasing hidden-camera videos showing her coworker handling her water bottle and pouring in a substance. Rong Yuan, now 50, said she began suffering dry heaving and hair loss in 2017. Her symptoms worsened to frequent vomiting and a persistent sour taste. After emergency-room visits, specialist appointments and tests failed to explain her illness, she traveled to China for treatment and feared she had stomach cancer. A gastroscopy found no cancer. Suspecting someone might be contaminating her food or water, Yuan bought a small camera and concealed it near her desk. The recordings led to the 2019 arrest of David Xu, her coworker at the time. A Berkeley police report said Xu had put cadmium, a toxic heavy metal, into Yuan’s food and water repeatedly over more than a year. Laboratory testing found cadmium in samples from her water bottle at levels as high as 3.5 million times the federal limit for drinking water, according to a lab report reviewed by investigators. Yuan recalled feeling that “my blood was frozen” when she first watched footage of Xu pouring a substance into her bottle. She is now speaking publicly and sharing the recordings. Xu was charged in 2019 with premeditated attempted murder and two felony counts of poisoning. He was later convicted and received probation and one day in jail, despite facing the possibility of a life sentence, according to the case summary provided.