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Jusme wrote:If it is on base, there would be check points.

Not always... There is a great swath of land between El Paso and WSMR that runs through the desert... You can drive from El Paso up to NM 213, and take that road all the way up to the back gate at WSMR main post. That will be the first check point you hit, but you are on WSMR property long before you get there. This was 20 years ago though, so things may have changed.

Ft. Sam Houston, San Antonio doesn't have check points, at least it didn't when I lived in San Antonio many years ago. This too may have changed.

How did the MP know about the handgun? When carrying under the TMPA, it has to be concealed and I don't believe there is any duty to disclose that he has a firearm to the officer. While I normally would, in the case of being pulled over by a MP on a TXDOT highway, I wouldn't say a word.