That may indeed be the case. Viruses have even less respect for political borders than people do.
...I’d bet there may be some law on the books down there that might even permit County sheriffs and such to deputize citizens to guard the border...
Law or no law, this is Texas. If we started to see a mass exodus headed our way from Mexico, the good citizens here would almost certainly deputize themselves to protect our state.
A friend of mine flew home to Orlando from Dallas where he had been attending a conference since Sunday. There were quite a number of people on the plane wearing masks. He had been busy at the conference and hadn’t watched much news so was quite taken aback at all the face masks.