In Texas, we've seen story after story after story of immigrant parents and children living along the border region who have been detained after medical emergencies forced them to travel through checkpoints. These stories have highlighted something most Americans probably don't know about the border area: that there are interior checkpoints which effectively wall in immigrants who live in places like the Rio Grande Valley. Tania Chavez, an organizer with LUPE, joins us to talk about what happens when immigrants can't leave their immediate town or region, for fear of being detained and deported. (Her interview starts at 11:45.)