3.1 Permanent disqualifying criminal offenses.There is also a magnetic strip (similar to a credit card) and a linear barcode on the back as alternative reading methods. The chip can be read by inserting it into a reader or holding it near a 'contactless' reader. The issued card contains a computer chip, known as an Integrated Circuit Chip ( ICC), which stores the holder's information and biometric data. To obtain a TWIC, an individual must provide biographic and biometric information such as fingerprints, sit for a digital photograph and successfully pass a security threat assessment conducted by TSA. The new measures were fully implemented on April 15, 2009. Those seeking unescorted access to secure areas aboard affected vessels, and all Coast Guard credentialed merchant mariners, must obtain a TWIC.

As of May 2014, there were 2,999,058 people enrolled in the program. Coast Guard credentialed merchant mariners. The TWIC program provides a tamper-resistant biometric credential to maritime workers requiring unescorted access to secure areas of port facilities, outer continental shelf facilities, certain manufacturing facilities, and vessels regulated under the Maritime Transportation Security Act of 2002, or MTSA, and all U.S. Coast Guard initiative in the United States. The Transportation Worker Identification Credential (or TWIC) program is a Transportation Security Administration and U.S. A sample Transportation Worker Identification Credential.

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