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It's very realistic to read every bill at every commercial transaction. A simple scanner hooked up to the 'net is not very expensive.

If one can deposit a check to a bank using a pic taken by one's cell phone, taking pics of all bills is not a much bigger deal.

Yes, I've thought of that but there's several issues for that to actually be realistic.

Now every company has to purchase a scanner and connect it at every PoS they have. What happens if a bill doesn't scan? Does the company refuse to accept it? What happens when customers get mad but the business still refuses to accept legal tender? What if the customer doesn't have enough other bills to try scanning? Do banks exchange unscannable bills? How do they scan them to be sure they're on the up-and-up? How long is it gonna take to scan several bills? How does the system tie that in to who is using it (otherwise, it's not really much of a tracking system..)? Is the cashier required to check ID and type in the name of every single person using cash? What if a scanner or connection goes down? Does the company have to stop using that particular PoS? Who is recording all of these transactions? Does the store keep a local server for this, like the 4473 logbook? Or is it ATF/NSA that's gonna keep track of this? What are the consequences of the store not keeping these records for a certain amount of time (say, 20 years)? Do you get in trouble if you use cash to purchase groceries for another person? What if you're under 18? What if the scan comes back that you don't have the mark and aren't allowed to purchase any food?