The sources quoted on the economic reasons for the decline in illegal immigration don't seem to be qualified to make that assessment. The first source is the president of the union representing the law enforcement agents at the border; his credentials seem valid for issues of law enforcement, but it's not clear what makes him an authority on complicated socioeconomic questions. Furthermore, while the article contains concrete numbers about immigration, the economic information is limited to colorful, subjective descriptions like "sour." At the very best, this article describes correlation, not causation. That these sources from law enforcement are trying not to take credit for the decrease in illegal border crossing hardly makes the case. The only interesting claim is that drug traffic has remained constant while overall illegal border crossing has decreased, but this is only measured by one variable and is hardly conclusive.