If someone in the u.s. was using an offshore bank debit card that was registered to "someone else" in some third world country when in fact its the same person, if not fatca then who or what might uncover this "flaw"? Would the issuing bank/s start to notice usage but not in the respective country where it was registered to? Would the banks raise red flags to fatca or someone/something like aeoi, tiea, or crs? If not the government, would it be the banks or the oecd protocols that would stumble upon this "error"?