Is an EU mandate for a "kill switch" in smart contracts feasible? Smart contracts, built on blockchain's immutable nature, automate trustless transactions. A kill switch could allow authorities to halt or reverse contracts, addressing fraud or illegal activities. However, this undermines decentralization and immutability—core blockchain principles. Implementing such a mechanism risks creating vulnerabilities, as a centralized authority controlling the switch could be exploited or abused. Technical challenges also arise: retrofitting existing contracts is complex, and new standards could fragment blockchain ecosystems. While the EU aims to enhance oversight, enforcing kill switches may deter innovation and adoption, pushing developers to jurisdictions with less restrictive regulations. Balancing security, decentralization, and regulatory compliance remains a significant hurdle.