So some people might wonder why, almost five years after 9/11, only about 5 percent of containers entering the U.S. are inspected.

If approved, the individual may then enter the U.S.

More than 87 million people enter the U.S. every year through airports, which makes them a primary point of entry for potential terrorists.

For example, you are a foreign student who entered the U.S. on a student visa.

For example, you entered the U.S. on a student visa to study at a university.

A voluntary return allows the person to enter the U.S. lawfully in the future.

And each year, millions of illegal immigrants enter the U.S.

All of these methods are very dangerous, and every year people die trying to enter the U.S.

She entered the U.S. illegally but immediately turned herself over to immigration officials.

One of my former students was deported to her country after being caught trying to enter the U.S. illegally.