How does a cat file? Ineligible people (particularly foreigners) file all the time.
There are presidential eligibility requirements in the Constitution but whose job is it to enforce them? Local election workers? State Secretaries? Congress? SCOTUS? The American voter? Whose job is it to say, "you aren't eligible and that's that!"
True. Apparently no one. I would think the age one is pretty basic though. It’s in the constitution and I would think there is a basic check before paperwork is processed. I guess common sense is not built into government processes. I think we knew that already though.