dangerous ways to do it. [ speaking spanish ] >> reporter: hiding inside vehicles is one way. huddled in the trunk or in hidden compartments. some of the spots people have crammed into are hard to believe. laying in dashboards, sewn into car seats, even under the hood. last month a detector dog alerted agents to this mercedes side panel. police say a woman was found inside passed out with a four-inch burn on her leg. last summer the auto x-ray discovered a man and his 15-year-old boy inside this makeshift gas tank compartment, both suffering chemical burns. over the years people have been caught inside rolls of carpet, in hollowed-out washing machines. this little girl was even stuffed inside a pinata. social workers here in mexico say most of the people that do take the drastic steps that risk their lives do so because they're desperate to get back to the u.s., because they have family there. wolf?