So... How much money did you USED TO spend at that establishment?
Do you think the owner ought to be made aware of that?
Regardless of what the law might be, I think it's funny that people who aren't legal professionals, who don't have degrees in psychology or who aren't sworn officers of the law would take it upon themselves to make judgements that they are clearly not qualified to make.
What would you say if you took your car to the auto mechanic and he threatened to call the cops because he thought your vision wasn't good enough to drive? What if your doctor said you couldn't leave his office until you fixed the headlights on your car? You'd tell them to go to hell. Unless there is a clear danger, those people people have no business making those kinds of demands. A photo lab operator is just as unqualified to make such a decision.
I don't think that the law reads that every bare bum must be scrutinized. I think the people in that shop stepped way over the limit. I don't think that business should be rewarded with a portion of your hard-earned income for being so stupid.