They'll just run their cash over the border to Mexico, instead of sending it via electronic means. This has already been happening for years, although the vast

They'll just run their cash over the border to Mexico, instead of sending it via electronic means. This has already been happening for years, although the vast majority of such cash running has consisted of illicit drug money. No reason why it couldn't expand to become the main way for illegal workers to get their cash heading south to their families, if there really were no other option.