[Nasrudith]

Attribuitation is one potential issue/ edge case source that I wonder how they solve. If two people enter/leave the check out area at the same time the "overlap" could get it confused. Machine vision could potentially pair better. Theoretically triangulation could help some but it brings to mind testing it by doing things like having two people walk side by side, pick up a bottle and drape it over th other's shoulders and seeing if it judges them as buying the opposite.