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Barcode Murderer part 2
How he actually murdered his victims, he was trained in anesthesiology, therefore killed his victims by pouring a fatal gas that causes his victim to stop breathing, quick and painless. Then proceeds to cut barcodes, the same ones on the books, on the wrist of his victim.

This was his way of recognising his victims, since he couldn't remember their faces. He used the barcodes on their wrists along with the barcode on the book to identify which victim it was.