A gang member becomes an informant after he's apprehended in Miami. Also: a marijuana grow house is raided by undercover agents; and the Coast Guard intercepts a boat carrying some 500 lbs. of cocaine and a mysterious substance.
Agents search for nine missing people in the Rio Grande. Also: a man wanted for murder tries to cross the border in Hidalgo, Texas; and a group of suspected drug smugglers are tracked through the night.
A rookie agent and his canine partner uncover some 1000 pounds of marijuana hidden in an 18-wheeler. Also: an Ecuadoran woman and her daughter are rescued after being abandoned by smugglers; and a group of illegal crossers send agents on a four-hour chase.
Agents try to identify the body of a young man who drowned while trying to cross the Rio Grande. Later, officers crack down on a human-smuggling operation and raid a safe house containing some 20 illegal immigrants.