Jack Chen said he started to notice a "chemical taste" in his lemonade around March and April.
A doctor diagnosed him with "two stomach ulcers, gastritis, and esophagitis," court documents said.
Chen put cameras in the house to see if his wife was poisoning him and said he caught her doing so.
A Newport Beach doctor said he caught his wife poisoning him with Drano on three separate occasions, a request for a restraining order filed on August 5 in the Orange County Superior Court showed.
Jack Chen filed for divorce and asked the court for a restraining order against his wife, Yue "Emily" Yu.
Yu was arrested on August 4 by the Irvine Police Department, a press release from the department said. She was released a day later after posting a $30,000 bail.
She has not been charged, and her attorney, David E. Wohl, told Insider, "Ms. Yu vehemently and unequivocally denies ever attempting to poison her husband or anyone else."
The husband said that his suspicions began around March and April when he said he noticed a "chemical taste" in his lemonade, which he typically likes to drink hot, court documents said.
When he developed symptoms, Chen, who is a radiologist, went to the doctor for an examination, the filing requesting a restraining order said, and it found two stomach ulcers, gastritis, and esophagitis.
"Based upon the diagnosis and my suspicions about the chemical taste, I put cameras in our kitchen," Chen's request for a restraining order said. "I obtained footage of Emily poisoning me on three occasions."
Chen's attorney, Steven Hittelman, did not immediately respond to a request for comment, but he told USA Today that his client recorded Yu putting drain cleaner in his drinks on July 11, 18, and 25.
"After the first video of finding out she was poisoning him, he took his morning tea and put Saran wrap over it," Hittelman told USA Today. " She still peeled it off and put the Drano in it."
Screenshots in the documents appear to show Yu in the kitchen, pouring something from a bright orange jug, which Chen said was Drano.
Another photo shows a close-up shot of the bright orange Drano jug.
Court documents preface the poisoning allegations with details of a long history of alleged abuse by Yu and her mother, Yuqin "Amy" Gu.
Chen said his wife and mother-in-law were physically and emotionally abusive to him and his two children.
"Emily's parenting, if you could call it that, revolves around yelling, insulting, verbally abusing, hitting, pushing, pulling, and being emotionally abusive," the documents said.
Yu's attorney denies these claims and said, "These defamatory, false allegations have been made by Mr. Chen in an attempt to gain an advantage in the divorce and custody case he filed against Ms. Yu a day after she was arrested."
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