SolvedVPDS162000 | Vaping Products Duty and Vaping Duty Stamps: Scanning events: Stamps are suspected of being involved in fraudulent activity
From HM Revenue & Customs · Vaping Products Duty and Vaping Duty Stamps guidance
Where it is reasonably suspected that stamps are involved in fraudulent activity, HMRC will alert the stamp supplier who will take immediate steps to deactivate the stamps and prevent their use. This means that if they are subjected to a scanning event, they will be flagged as illegitimate.