Maybe Texas is just running out of stuff to shoot at.
They’ve always been pretty common in the Hill Country.
I like the little guys. We used to chase them at summer camp out west of Austin. They’ve got very powerful legs for digging so to catch one grab it by the tail and lift.
We lived in Vero Beach, FL, a while back, and there were several wandering around the community. Likewise north of Jacksonville. Come to think of it, the west coast, too.
They DO seem to expire on their backs. Once, we passed a dead one, didn’t seem banged-up at all. Especially because someone had put an empty Bud Light bottle in its cold, stiff paws.
Stop laughing; have some respePPPBBTHTHTBBBPB! 
Since yesterday morning I’ve driven 1,200 miles, from south Florida to central Georgia and back. Tally: zero live 'dillos, 6 dead. Of those, 5 were in dorsal recumbency – on their backs. The other one was sort of on its side, but it was on the center line of a 2 lane road and it was pretty messed up. So I don’t think it landed that way, but was more like mashed into it.
I still don’t know what this says about the critters, but the numbers seem consistent.
You read stories about rural yokels, where to be fair pests like wild hogs or coyotes or armadillos are an issue.
Texas also features things like the fourth most populous city in the USA.
I finished my trip with another 250 miles today. Two more 'dillos, one up, one down. So the count total is 6 upside down, 1 right side up, and 1 sideways. I don’t think any of them were gunshot though, so no help to the OP. Sorry.
Oh. Then you call animal control in Dallas and Houston?
I’m just asking because I’ve had people stare at me with deer-in-headlights eyes saying, “…animal ka-what now?”