When I was growing up in east Texas, I caught everything I get my hands on including using various kinds of traps. In particular, there is no telling how many snakes, lizards, turtles, toad, frogs and salamanders that I at least temporarily added to my collection. At the time there were no laws related to collecting or capturing reptiles and amphibians. Wow, has that changed.
One important part of all this is that you cannot even temporarily capture or handle reptiles or amphibians even if you are just trying to photograph them if you are on a road, shoulder or unpaved part of the right of way unless you have a Texas hunting license with a reptile and amphibian stamp. It is up to a $500 fine.
This also includes your actions as a citizen scientist working with the TPWD Texas Nature Trackers (only on public roads). That program is for private lands, not public areas or roadways.