In Canada, if any item get scanned improperly (above the quoted price) it's free. It's law.
Up to a maximum of 10$
That being said, Ive seen items scanned improperly, customer makes it known, manager comes, changes it, and that's the end.
NEVER once seen an issue over the matter. Ends as quickly as it starts
I feel like a guy like MOP would get the free item and still write to corporate that if he wasnt a savvy, aware customer, Walgreen's would have taken advantage of him and countless other fixed income families - and seek reparation like that race of minorities he doesn't seem to like working in his Walgreen's got.