Wow didn’t know so many were going to find this tweet, another detail is that Xu, being a lawyer and premeditating this, apparently thought he was going to get away with an insanity plea and did a lot of groundwork to try establish mental illness.
From an article titled
“China's "Breaking Bad" case: Purchased poison-containing probiotics from Japan, sought to escape charges by feigning mental illness.”
“In order to escape punishment, Xu Yao not only hired a team of lawyers for a not-guilty defense but also prepared extensively for a psychiatric evaluation to use this status to avoid legal punishment. It is known that Xu Yao previously purchased a large number of books to understand how to undergo psychiatric evaluations and searched online for papers and materials, inquiring into domestic and foreign cases where punishment was avoided due to psychiatric evaluation.”
Full article in Chinese:
m.jrj.com.cn/madapter/stock/…