If someone is detained because they appear ill, a medical expert from the Centers for Disease Control and Prevention comes to the scene to check them and, if necessary, send them back over the border.
VOA: standard.2009.04.30
She remembers flying with him in his single-engine plane across the Iowa border to check out crops, even though he didn't own them.
The figures come on the same day the Chief Inspector of Borders John Vine warned that thousands of overseas students may have been allowed to stay in Britain illegally because UK Border Agency staff failed to check out tip-offs about them - a backlog of 153, 000 had built up at one point, he said.
"A lot of Americans come down to Mexico and check their brains at the border, " says Duane Christie, an owner of the Century 21 master franchise in Mexico.