Earlier quoted context omitted.
The system described sounds like a terrible idea. In order to prove someone lied on the form when they said "No" to "Are you a spy?", you have to prove they're a spy. At that point, you're free to deport them; the form is irrelevant.
I'd wager there is no outright "Are you a spy?" question, but questions written that are highly likely make or break questions (Who's your current employer? Listing a foreign government as your employer on a student visa application may often be a deal breaker depending on the relationship between the countries). By giving a false answer, you've committed fraud. It doesn't even require you to be a proper spy of any s…
This isn't 4D chess, it's creating a reason you can detain someone once you know what they're upto without having to blow what you know about their real activities (which might lead to too many shutting down before you want them too).