This explains why the defendant wasn't informed of his rights as a Mexican national at the time of his arrest or during his trail.
Quote:
First, let us be clear about applicant's claim. Born in Mexico, applicant was brought to the United States when he was three years old and, at the time he was arrested, had lived in this country for fifteen of his eighteen years. He spoke fluent English, but he never obtained, nor apparently ever sought, U.S. citizenship. So, at the time of his arrest and trial, he was legally a Mexican citizen. His claim is that no one informed him of his right to contact the Mexican consulate. This is true. It is also true that he was never denied access to the Mexican consulate. The problem is that he apparently never told any law enforcement or judicial official that he was a Mexican citizen until some four years after his conviction. Applicant never informed the arresting officers that he was a Mexican citizen. (1) He makes no claim that he informed any magistrate that he was a Mexican citizen. He points to no evidence that he informed the trial judge before or during his trial that he was a Mexican citizen. (2) We do not know what the arresting officers, the magistrate, or the trial judge would have done had any of them been informed that applicant was a citizen of Mexico. Perhaps they would have informed him of his right to contact his consulate for assistance. While Texas authorities clearly failed in their duty to inform this foreign national of his rights under the Vienna Convention, this foreign national equally failed in his duty to inform those authorities that he was a Mexican citizen. Although one would like to think that all Texas public officials are clairvoyant about the nationality of all who appear before them, they are not required to be, nor, when there is no reason to believe that a defendant is anything but a U.S. citizen, should they be.
As this Court explained at considerable length in applicant's last application for a writ of habeas corpus, Texas law does not permit a defendant to raise a claim four years after his trial that he was not notified before or during his trial of his rights under the Vienna Convention, the U.S. Constitution, the Texas Constitution, or any other law. This claim was procedurally defaulted by the failure to raise it in a timely manner.
https://www.bakers-legal-pages.com/cca/opinions/cca17174.htm