Comment by slow_typist

There are better (and offline) solutions to detect temperature dips in the freezer (e.g. a thermograph, or cheaper, solutions that change color). And as a former trucker delivering frozen and refrigerated goods I can tell you the most dangerous part of the journey to the customer is not in the freezer of the POS. That being said, I admit I don’t know the legal requirements today. But I doubt someone will be sent out at night to salvage a few pounds of frozen spinach.