Which feature is NOT currently implemented in mainstream smart shelf technology for grocery stores?

The modern grocery store is becoming increasingly intelligent through IoT technology. Smart shelves are revolutionizing how food retailers manage inventory, detect theft, and enhance customer experiences. These technology-enabled systems can automatically track stock levels, alert staff when items are misplaced, and even change prices dynamically based on demand or expiration dates. How much do you know about this cutting-edge retail innovation that's transforming the food industry?

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Automatic weight sensors that detect when products are removed from shelves
Digital price displays that can be updated remotely in real-time
Taste-testing sensors that analyze food quality and freshness
RFID technology that tracks inventory and reduces stockouts