I used to work at a well known crisp manufacturing place.
The incidents that happened there was always on the night shift and it happened in the men and women’s toilets.
People (say people because it was a heck of a job) would spread their poop, blood and sick around the toilet cubicles
And around the squat over toilet ( hole in the ground so gents could squat).
This happens around three to five times a month. People would be escorted to the loo for a while, but when that stopped all the poop and whatever would be back.
I don’t eat crisps from that company anymore.