Passports usually have, at least, your finger prints in the chip. And as I said, they have tons of data on you (pics, medical stuff, telecom, etc). It all depends on how ez it is for the competent administrative services to access those databases (do you really think the MI6 does not have access to those database?)

Why do you think having microsoft having access to the global networks of IT professionals via its owned linkedin database is something that should not even be possible?