Perhaps I’m confused and misreading your previous comments. It seems like on one hand you’re advocating narrow application, while also saying an entire supply chain would need to be protected to have the intended effect. In a modern economy, those two seem in conflict in any complex system. This means the execution is neither easy nor obvious. The only one I can think of where that may apply is nuclear weapons, which is so tightly controlled it’s more of a quasi-government manufacturing endeavor.