(a) It is no defense to prosecution that the actor was ignorant of the provisions of any law after the law has taken effect.
(b) It is an affirmative defense to prosecution that the actor reasonably believed the conduct charged did not constitute a crime and that he acted in reasonable reliance upon:
(1) an official statement of the law contained in a written order or grant of permission by an administrative agency charged by law with responsibility for interpreting the law in question; or
(2) a written interpretation of the law contained in an opinion of a court of record or made by a public official charged by law with responsibility for interpreting the law in question.

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Terms Used In Texas Penal Code 8.03

  • Actor: means a person whose criminal responsibility is in issue in a criminal action. See Texas Penal Code 1.07
  • Agency: includes authority, board, bureau, commission, committee, council, department, district, division, and office. See Texas Penal Code 1.07
  • Conduct: means an act or omission and its accompanying mental state. See Texas Penal Code 1.07
  • Law: means the constitution or a statute of this state or of the United States, a written opinion of a court of record, a municipal ordinance, an order of a county commissioners court, or a rule authorized by and lawfully adopted under a statute. See Texas Penal Code 1.07
  • Written: includes any representation of words, letters, symbols, or figures. See Texas Government Code 311.005

(c) Although an actor’s mistake of law may constitute a defense to the offense charged, he may nevertheless be convicted of a lesser included offense of which he would be guilty if the law were as he believed.