Question about national consumer panel (ncp)

So all you have to do is scan the barcode of items you "purchased" but they don't ask for any sort of proof of purchase, so what's stopping people from just scanning expensive barcodes in store and not actually purchasing things?

submitted by /u/fallriver1221
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source https://www.reddit.com/r/beermoney/comments/1b2sh1f/question_about_national_consumer_panel_ncp/