30.05 does not apply to Peace Officer OR Special Investigators
It is not possible for Taco Cabana to keep Peace Officer or FBI agents from carry firearms inside thier stores.(g) This section does not apply if:
(1) the basis on which entry on the property or land or
in the building was forbidden is that entry with a handgun or other
weapon was forbidden; and
(2) the actor at the time of the offense was a peace
officer, including a commissioned peace officer of a recognized
state, or a special investigator under Article 2.122, Code of
Criminal Procedure, regardless of whether the peace officer or
special investigator was engaged in the actual discharge of an
official duty while carrying the weapon.