We were talking about people illegally crossing the boarder and who were not carrying their passports etc. In such cases, where they are committing one crime, it is logical to assume that they would commit others. If I was crossing a boarder with children, I would want the officials to pay attention and double check everything is ok.
Discussion
Right, so if you get a speeding ticket with your kids in the car we're going to need to DNA test you and your kids and detain you both separately until test results prove relation.
You committed 1 crime so definitely the kind of person who would commit others. Plus, what parent would endanger their own children like that so we have reason to suspect the specific crime of trafficking.