Answer:
There are a few challenges associated with using barcodes, including:
Misread barcodes: Barcodes can be misread due to dirt, damage, or poor printing.
Obstruction: Barcodes can be obstructed by dirt, mist, or protrusions.
Line of sight: Barcodes must be scanned at line of sight, usually within one meter.
Cost: Barcode readers and printers can be expensive.