S2, E2: An 18-wheeler carrying more than 1,000 pounds of concealed marijuana is discovered by a rookie agent and his canine partner. A group of illegal crossers takes agents on a four-hour chase after setting off sensors, and it requires the help of local ranchers and a thermal imaging camera to catch them. An Ecuadorian woman and her young daughter — injured, dehydrated and famished — are rescued from the harsh terrain after being abandoned by smugglers, and face deportation unless the mother can prove they have reason to fear for their lives back home.