Can the QR code be scanned just a single time?

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Yes, a QR code can be scanned just a single time. Once scanned, the information contained in the QR code will be accessed by the scanner, but the code itself will not be "used up" and can still be scanned again in the future. However, the information within the code may be time-sensitive, meaning that it may no longer be relevant or accurate if scanned again at a later date.