The most common biometric modalities used are fingerprint recognition, iris recognition, voice recognition, and even facial recognition. In the United States, health care is one of the largest market segments for the use of biometric technology. The primary catalysts are the recent legislations and mandates passed by the US government such as the Health Insurance Portability and Accountability Act of 1996, Sarbanes-Oxley Act, and the Gramm-Leach-Bliley Act. The use of biometric technology in an e-passport infrastructure can actually help to enhance as well as improve the efficiencies and qualities of conducting a background check on a particular passport applicant. For instance, the e-passport has not been around for as long as the paper passport or the machine-readable passport in which time was afforded to them to develop a standard set of best practices for the countries around the world to adopt.