Mafia 33. The American Dream

Hermit, here's the thing:

Relying on the suspect's words? We've already discussed why the absence of citizenship is much more likely. Omega considered the Mafia to be some kind of "overly knowledgeable geniuses" who devised a "clever plan" to write a note about his lack of citizenship.
In the first note, the so-called "checker" didn't even mention who he was going to check. In the second note, however, he clearly stated who he was going to check, and, interestingly, he did check. The probability of a setup by the Mafia is extremely low.