Engineer releases video showing coworker adding substance into her drink, alleges she was poisoned An engineer in Berkley, California, released spy camera footage of her coworker adding a substance to her drink. She alleges that he poisoned her for months. CBS News' Shanelle Kaul has the latest. Source: https://www.cbsnews.com/video/engineer-releases-video-showing-coworker-adding-substance-into-her-drink-alleges-she-was-poisoned/