From The Center for Public Integrity:

The key electronic components for millions of American e-Passports, the crown jewel of a new U.S. border security system, have been put together inside a little-known factory in Ayutthaya for the past four years.

Thai workers there assemble inlays that embed wireless transmitters and sophisticated computer chips that store biometric and other personal information used by customs officials and border guards to verify the identities of those who enter the United States.