This detection rule flags users who attempt to scan a receipt that has already been scanned. This can weed out "Dumpster Divers"; users who collect and attempt to scan discarded receipts.
The Threshold no. of re-scans can be Set/defined in the provided field under the mentioned rule. It can be found under the "Activity Detection Rules" in the "Settings" section on the dashboard. Please find the screenshot below. 
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