JUDY WOODRUFF:

The USA TODAY NETWORK published an ambitious project today exploring the complex world of those who live along the Southern U.S. border and how President Trump's proposed barrier structure might affect them.

"The Wall" combines print reports, photographs, interactive maps and video.

William Brangham will be back to talk to one of the lead reporters on the series.

But, first, here's one of its featured films, this one focusing on the cat-and-mouse game between U.S. authorities and the drug smugglers who try to evade them.