We were able to get my son in-state tuition to UT in 2011 (shortly before he fell ill and had to withdraw), but it was tough, even then. They’ve tightened up the rules since and I don’t think we would be able to do it today.
Oh, and the way it worked was that he had to pay OOS tuition his first year in school, so that stung (his grandparents helped out with the extra cost).
If anyone decides to try it, though, the school is very willing to answer questions and help you out. They don’t discourage you from trying.