Reminds me of all the people mysteriously dying in the Dominican Republic[1]. The best I could figure out from reading about it was that illegal pesticides were being used in hotels to eradicate bed bugs and they ended up getting on bottles of stuff in the minibar and in the food and randomly killing or making people extremely sick all over the country and the resort chains covered it up.

[1]https://nypost.com/2019/06/28/fbi-to-release-toxicology-resu...