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Your u.s passport uses ink that you can see for your name and address, but it also uses ink that only shows up under UV lights. Holding your passport under a UV light is one of the first things that a customs agent will do to check its validity. Passport technology is always evolving, and one aspect of passport security that is always under heavy scrutiny is the RFID chip. This electronic chip embedded in the cover of your passport carries a copy of all your vital information. So if someone stole your passport and changed the name or the picture, a customs agent could still scan the passport and see that the information doesn't match. The big fear with RFID chips is that someone you don't want to scan your passport will be able to get a read through your pocket or your luggage and steal your information. This is very unlikely, but smart people are hard at work making sure it can't happen in the future. With all of the technology at work in passports, they are incredibly hard to fake. It's much more common these days for fraudsters to use passports they have stolen than fake a passport. If you ever lose your passport, make sure to report it missing as soon as possible so anyone who tries to travel with it can be caught (and so you don't get into trouble for things they might do).