>The expiration of these packets were measured in days or maybe a week, not weeks. That isn't a particular hurdle. There are plenty of products in my local sup

>The expiration of these packets were measured in days or maybe a week, not weeks. That isn't a particular hurdle. There are plenty of products in my local supermarket that have an expiration date measured in hours after purchase (usually about 3 or 4 days in total, the sticker is printed on-location, this especially concerns some raw meat products). >Also, as I mentioned above in another comment, there could be particular product recalls like the current romaine lettuce recall. That might require an internet connection but not permanent either. The juicer could simply have a blacklist of product IDs. Supermarkets also already implement this at the checkout. The cashier will be unable to add the item to the bill, even if a supervisor gets out their admin keys and tries it manually (the computer will even block same-price manual entries after a blocked item is scanned during checkout).