SouthTexas:
That really hasn't been established either.
Google finds an article in the Houston Chronicle on December 9, 2007 stating that Celis never graduated from law school in Mexico. Unfortunately that article isn't available for free on the internet any more. Perhaps someone who has a subscription to the Chronicle could post it on this thread.
Google News search for "celis practice mexico law school"
Mexican records show political donor hasn't finished law school
Houston Chronicle, United States - Dec 9, 2007 Defense lawyer Steve McConnico said Celis has not dropped out of law school. "Mr. Celis has been and is now authorized to practice law in Mexico," McConnico ...
I've yet to see any of his qualifications published to practice law-anywhere.