While there is no scientific university study entirely dedicated to the mechanical cutting of bank cards, it is recommended not to adopt this habit. Many people have developed the habit of destroying bank cards when their expiration date is reached, often by cutting them with scissors. However, this action should be avoided, especially for newer cards that include a dynamic cryptogram. In her 2020 doctoral thesis, French researcher Claire Deilhes explained the structure of these cards, including the integration of lithium micro-batteries less than 0.5 mm thick, which power the e-paper screen of the dynamic cryptogram. The mechanical shearing of lithium-ion cells can cause a dangerous phenomenon called thermal runaway, leading to an instantaneous chemical short circuit. The ultimate danger lies in the release of hydrogen fluoride, a toxic chemical compound. Upon contact with moisture in the eyes, skin, or respiratory tract, this gas transforms into hydrofluoric acid, a highly corrosive and toxic substance that can cause severe harm. Cutting bank cards also poses an environmental problem. Since the cards contain an e-paper screen, an NFC antenna, and a lithium micro-battery, they are considered part of the category of Waste from Electrical and Electronic Equipment (WEEE), similar to smartphones and tablets. The issue is related to sorting and the recovery of precious metals. The chips and circuits of the cards contain materials such as gold, palladium, copper, or silver. If the card is cut into small pieces, these materials are reduced to crumbs and can no longer be recovered by WEEE treatment centers, as they may end up incinerated or buried, representing both a waste of resources and pollution. The separation of plastic from other materials is also important, which is why recycling channels request the collection of whole cards. The historical fear of having one's numbers stolen by throwing the entire card away no longer has a technical basis today. According to security experts, the card is technically dead once it is expired or deactivated in the bank's system. Strong authentication protocols, particularly on smartphones, make fraud much more difficult to carry out.