the fuckers have cameras and "AI" detection here, if it looks and sees something it doesn't think is a banana the whole thing stops and signals a staff over. doing groceries is seriously more fucked than going through airport security now.
There is a DVR product called SaleGuard that can detect this from existing or integrated camera systems. It tends to work fairly well.
I mean, they're not gonna nab you for apples unless they get enough of a rolling tally on what you took to actually prosecute usually. That's what most corps do.
colour probably matters too. you could probably get away with something in mushroom bags (brown paper bag) but of course only worth it for things worth more than mushrooms