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Perhaps it might be considered an office utilized by the court (Office of the Attorney General).

PC §46.03. PLACES WEAPONS PROHIBITED (a) A person commits an offense
if the person intentionally, knowingly, or recklessly possesses or goes with a
firearm, illegal knife, club, or prohibited weapon listed in Section 46.05(a):

(3) on the premises of any government court or offices utilized by the court,
unless pursuant to written regulations or written authorization of the court;