... Word of the Trump administration’s new “zero tolerance” policy, which calls for prosecuting everyone who crosses the border illegally, has been traveling along the migrant trail that winds through Mexico and Central America. People learn of it by television, by social media and, mostly, by word of mouth. While the policy has stirred controversy in the United States, with lawmakers from both parties calling for its end in the face of defiance from the Trump administration, it has sowed confusion for the migrants bound for the United States, who are struggling to make sense of what it means for...