🤦♀️🤦♀️🤦♀️ Unbelievable. And this is routine for them, they are not thinking through what they are doing. And this is how you get infected with God knows what, although you've been careful.
I would put surveillance cameras everywhere for a week and confront them after. Keep them a good lecture to see what they are doing. It would be a lesson for life. Or not, as some people never learn. Sad, very sad.