Next time you enter or leave the U.S., check the customs form for this reference.

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These allow trusted travelers to enter the United States and Canada with expedited clearance through immigration, security, and customs.

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Rockefeller and other critics of the industry say that cruise lines that are headquartered in the United States but have their ships registered elsewhere are getting a free ride on the backs of U.S. taxpayers, placing demands on federal agencies such as Immigration, Customs and the Coast Guard, which are charged with oversight when those ships enter and leave U.S. ports.

CNN: July 8, 2012 -- Updated 1911 GMT (0311 HKT)

"The fact that a foreign national was able to re-enter the U.S. with what appeared to be a valid student visa, while Customs and Border Protection officers were unaware that his visa status had become invalid, represents a serious hole in our national security, " McCaul told CNN.

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Approved travelers get to use a kiosk to enter the country rather than waiting in often-long lines to get their passports stamped and go through Customs inspection.

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