...if you give enough anticoagulants to achieve such an effect, the effect will be in minutes to hours. Nothing will happen from a small dose.Are you saying it's not even plausible? Off the top of my head I can think of many ways to make Xi sick, and it wouldn't kick in until he left the US or even a week later. Just a quick example. Food laced with Apixaban and plavix causing a GI or hemorrhagic stroke. Easier than you think. Undetectable after a few days. I work in medial overdose and toxicology. What are your credentials?
I mean the US allowed their company to sell HIV laced hemophilia drug to HK in the 80s causing a spike in HIV cases in China. It's true, google it if you don't believe me. I would not put it past the US to try and poison people they deem to be key in another countries stability.
Are you one of those people who also think that Canada would never kidnap Meng Wanzhou? Or the US would never dare to bomb the Chinese embassy in Belgrade?
Every possibility needs it be considered and properly vetted. It's a war. So get off your high horse and consider all the possibilities.
PT and thromboelastrometry respectively will detect these medicines. Not only that, but electronic trail back to US will make such an operation impossible without revealing themselves. It would be an unprecedented act of war that would immediately remove any chance of anyone except US taking their side. Not to mention giving China carte blanche justification to void immunity on US diplomatic staff globally.
For that massive, massive, setback to US, Xi Jinping or even every person on the diplomatic team to US is a tiny price to pay.
Besides, more practically speaking, how would US know which person from the security team/Xi himself eats which dish? If they attempted an operation against China's staff, it is far more likely that they kill some random team member and incur every single penalty from above, without even getting at Xi.