Call Mark Thiessen The Texas Trial Attorney at: 713-864-9000br Thiessen Law Firmbr 1221 Studewood St.br Houston, TX 77008br Visit my youtube page for more helpful DWI tips.br br The definition of intoxication in the state of texas has three parts. The first being not having the use of your mental faculties due to intoxication. The second is not having the physical faculties due to intoxication. And the third is having a chemical test that shows blood alcohol concentration greater than 0.08. Any one of those can actually determine intoxication.