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"f) It is a defense to prosecution under this section that:

(1) the basis on which entry on the property or land or in the building was forbidden is that entry with a handgun was forbidden; and

(2) the person was carrying a concealed handgun and a license issued under Subchapter H, Chapter 411, Government Code, to carry a concealed handgun of the same category the person was carrying."

http://www.statutes.legis.state.tx.us/D ... .htm#30.05