I live in Texas also. I believe if you get pulled over and if you don't have a drivers license you shouldn't get more than a ticket. I know this, since I know a few people who have been pulled over and nothing happened to them, other than getting a ticket. If you have a Mexico driver's license you have an advantage since if you were to get pulled over you could just say your visiting.
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"You may say that I'm a dreamer but I'm not the only one..."
-John Lennon