From 2019...
US intelligence warns China is using student spies to steal secrets
https://www.cnn.com/2019/02/01/politics/us-intelligence-chinese-student-espionage/index.html
Beijing is leaning on expatriate Chinese scientists, businesspeople and students –...roughly 350,000 from China who study in the US every year – to gain access to anything and everything at American universities and companies that’s of interest to Beijing, according to current and former US intelligence officials, lawmakers and several experts.
When we had Chinese visitors, everyone was told to clear their desk and put "junk" as the only documents visible.
Lotsa of female students working in our labs in schools. My granddaughter said they spoke Chinese almost all the time. They were also...very, very wealthy.