Interesting, caught my eye ...
Metal Detectors at ... "Public Works Building"
After 9-11 .... perhaps the public works building might be a critical infrastructure facility( under 30.05 )
The metal detectors may be there to enforce 30.05
http://www.statutes.legis.state.tx.us/D ... .htm#30.01" onclick="window.open(this.href);return false;
TEXAS PENAL CODE
TITLE 7. OFFENSES AGAINST PROPERTY
CHAPTER 30. BURGLARY AND CRIMINAL TRESPASS
Sec. 30.05. CRIMINAL TRESPASS
(7) "Critical infrastructure facility" means one of the following, if completely enclosed by a fence or other physical barrier that is obviously designed to exclude intruders:
(A) a chemical manufacturing facility;
(B) a refinery;
(C) an electrical power generating facility, substation, switching station, electrical control center, or electrical transmission or distribution facility;
(D) a water intake structure, water treatment facility, wastewater treatment plant, or pump station;
(E) a natural gas transmission compressor station;
(F) a liquid natural gas terminal or storage facility;
(G) a telecommunications central switching office;
(H) a port, railroad switching yard, trucking terminal, or other freight transportation facility;
(I) a gas processing plant, including a plant used in the processing, treatment, or fractionation of natural gas; or
(J) a transmission facility used by a federally licensed radio or television station.
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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.