It's been going on for over 10 years already with barcode IDs in high schools. Now you don't even see the person doing it because they can hide 2 or more cards

It's been going on for over 10 years already with barcode IDs in high schools. Now you don't even see the person doing it because they can hide 2 or more cards in a wallet and scan them all at once. The only tip would be a suspiciously close time stamp if anyone cares to look. A school setting is the worst environment you can possibly imagine trying to secure anything, let alone attendance.