In your scenario we’d know because people would be arrested. Of course they won’t be. Because the reality is anything that can be recorded can be forged. It’s not going to stop passport fraud, it’s just going to mean people modifying passports need to have another tool in their arsenal, a fairly cheap, find it on Amazon tool.
There is actually a soft lens that can be imprinted with another person’s retinal imprint. Anything that can be done can be hacked.
All this so called airport screening has yet to catch even one terrorist since 911. Its not about security its about controlling the US citizen population and slowly desensitizing us to more and more invasive activity. As you can read on this thread there are a lot of willing drones joining the hive.