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Texas, like Georgia, doesn’t give two figs about the Supreme Court’s prohibition on the execution of mentally retarded people. 
From Salon:
In 2002 the Supreme Court ruled that executing the mentally retarded violated the Eighth Amendment. The Court left it up to individual states to decide on what procedures to use when determining whether defendants were in fact mentally retarded, or were falsely claiming to be so. (In a characteristically brutal dissent Justice Scalia argued that the inconvenience of sorting out false claims from valid ones was a good reason for not barring such executions.)