Furthermore, the subset of illegal migrants who cross the border away from ports of entry is the subset that contains almost all the criminal deportees, new cri

Furthermore, the subset of illegal migrants who cross the border away from ports of entry is the subset that contains almost all the criminal deportees, new criminal migrants, and other people who wouldn't qualify to enter as tourists because they've already worn out their welcome. It seems that preventing and/or detecting illegal entry over the border is the most effective way to reduce the number of known criminal aliens entering the country.