Did some research on how commercial age-verification scanners operate. Handheld BCS scanners and tablet-based VeriScan terminals parse the PDF417 barcode for AAMVA subfile compliance (specifically the DL/ID standard, document discriminator, and issuer identification number IIN). Having a high-density 2D barcode that matches the printed name and DOB exactly is what guarantees instant green scans at venues.
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BCS vs VeriScan: What handheld scanners actually check on 2D PDF417 barcodes
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