Good point. And... which immigrants like to manage 7-11's and drive cabs (or do both, like that guy in Chicago)?
I think that someone from another country, who was used to writing the date as DD-MM-YY might chose to still write MM-DD-YY with a zero added at the beginning for months with 1 digit.
A question for the FBI: Why wouldn't an angry, native-born, lone scientist use a computer to write his note? If he were smart enough to imitate a medically-savvy Arabic letter writer he would be smart enough to know that Arabic letter writer would probably have a computer.
I think Atta wrote the notes and passed them to someone else to mail. He was angry and sweaty.
Now, the question is, did Atta lick the envelope flaps or did someone else?
CDC could check death records for the period September 8, 2001 to the present and find some Middle-Easterner, possibly a child, who died of symptoms suspiciously like those of anthrax.
A sweaty-toothed madman? [from Carpe Diem]