Drinker's rule of conduct?
Else clues• It's machine-readable
• It's read at registers
• Lines at the checkout counter?
• Lines at the grocery
• Product lines?
• Scannable price tag
• Scanned lines
• Scanner reading
• Something scanned
• Sot's rule of conduct?
• Supermarket lines?
• Supermarket reading
• Supermarket scanner input
• Supermarket scanner's reading