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Jurjen said:
Yep, someone in the UK actually made a great documentary on how easy it is to get access to the chip and rewrite it with your own data. Look up "Suspect Nation" by Henry Porter.

It's now so easy to commit passport fraud, because the government organizations just think their technology is foolproof.

It is always possible to get past a "system", but it is much easier if the owner believes that their system is perfect ;D
 
So will the IO do these checks when processing a visa application?
What if someone put a wrong return to UK date in their application by mistake, would they get picked up on this?