The CIA produces a report entitled “A Reference Guide to Terrorist Passports.” The report discusses a suspicious indicator of terrorist affiliation that was contained in the passports of at least three of the 9/11 hijackers, possibly more. The indicator was placed there deliberately by the Saudi government, which used such indicators to track suspected radicals (see November 2, 2007). However, this report is classified and is not disseminated, meaning that if a radical were to arrive at a US port with a passport indicating he was a terrorist, an immigration official would be unable to recognize the indicator and would admit him. Over a year after this report is completed, the 9/11 Commission will show a passport bearing this indicator to one of the immigration officials who admitted 9/11 hijacker Khalid Almihdhar to the US, but she will still be unable to recognize the indicator. [9/11 Commission, 8/21/2004, pp. 25, 27, 41 ]