From the LA Times:
Christopher Galeano, a UC Irvine student who worked at migrant shelters in southern Mexico last summer, said Cubans stood out in part because they were eligible for a legal permit, called an oficio de salida, that allowed them to stay in Mexico up to a month

For the full story, please visit http://www.latimes.com/nation/la-na-cuba-texas-migrants-20151124-story.html.