“In four . . . studies, we found that fewer than half of migrants who come to the border are apprehended, even once, by the Border Patrol. . . . [T]he apprehension rate found in these studies varied from 24% to 47%. And of those who are caught, all but a tiny minority eventually get through—between 92 and 98 percent, depending on the community of origin. If migrants do not succeed on the first try, they almost certainly will succeed on the second or third try.”
