[Marine Inspector]

In the case of illegal immigration, the citizen would have to see the guy cross the border illegally.

Now, if you saw a person cross the border, in the middle of the desert, how do you know he's committed a crime?

[BeHoldAPaleHorse]

Now, if you saw a person cross the border, in the middle of the desert, how do you know he's committed a crime?

My understanding from a long time ago as a cop is that entry to or exit from the United States must be done through a legal point of embarkation/debarkation.