Fair point (here in Spain males and females have sometimes the "son of" surname). But I think that he's trying to say that the smuggler has warned him that the

Fair point (here in Spain males and females have sometimes the "son of" surname). But I think that he's trying to say that the smuggler has warned him that the passport contains the biometric data of someone, so when scanned a different photo will pop up (you can see the electronic passport symbol in the cover). Probably the forger has just altered the name and picture on the paper, but can't tamper with the microchip that contains the data of the real owner.