DPS has several helicopters in their fleet and I regularly run across them in my job but I’ve never heard of them doing traffic. Typically it’s CBP missions and tracking people fleeing in areas where the city doesn’t have air support. They do have flir pods on the belly. Lots of times when college games are being played I’ll see them circle the perimeter for hours. All H125s as far as I’ve seen.
When the Houston hellcat chase and some others happened they came out.