On the journey into the United States, a stay in one of Houston's "drop houses" often is the last stop illegal immigrants make before their lives begin in this city. It's a dehumanizing experience. Immigrants — treated as cargo — are known as pollo, or chickens. They're often held at gunpoint and forced to subsist for days or weeks in stifling and filthy conditions before their smuggling debts are paid. These houses are all over Houston, say federal authorities, who find at least one a week. A shootout last week in southwest Houston underscored how problematic these illegal transfer sites...