While waiting for my food, I noticed two casually dressed man talking to the lady assistant manager of the restaurant. One of the man was pointing to the table setup and asking the lady some questions. My instinct tells me they must be from the government health agency.
True enough, this was confirmed by the assistant manager when she came by our table.
Apparently, someone took a photo of what looked like a tomato ketchup or chilli sauce stain on the table cloth and sent it to the authority.
Customers that don't complain are the most dangerous.