As the residents of McAllen, Texas, sleep soundly, a small number of agents of the U.S. Border Patrol wait in dark shadows on the northern bank of the Rio Grande. Those few, thinly spread watchers are the first line of defense against a chaotic tide of undocumented workers and determined drug smugglers with only one goal in mind: to cross the river to el Norte. Patrolling Chaos is based on extensive ethnographic field work focusing on one station...