There was a company called "stop lift" that deployed cameras on its check out lines. Looking for fraud by employees and probably self checkout.
Whenever I'm in a store at the cashiers I look up and often see lots of camera domes above the register.
There's been a trend in self checkout to have at least two cameras directly on each machine, one in the screen pointed at your face, and one overhead on a mast pointed downward.
https://www.stoplift.com/about/why-stoplift/