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DPS
My experience leads me to state that DPS are very skilled with their Stalkers... they generally are very discrete and can be difficult to flush out if they only use it once every few minutes. Vehicles include marked cars and trucks. Very rarely will I see a slick... Dodge Intrepid I believe it was.

Austin
Austin PD uses mostly Ka in their newer cars. They have a Ford SUV "Highway enforcement" with K band. Rookie cops also are assigned K band hand held units. Never seen X used. Almost all cars are marked. Most slicks are assigned to special task forces, so unless it's "DWI enforcement" you don't have to worry about them being too sneaky. They set up traps with mostly laser. They rarely issue warnings.

Small cities

Burton is Ka.
Thrall is K.
Rockdale is Ka.
Manor is K.

Counties

Travis county cars use Ka and K, and they usually leave them on all the time. They also set up traps with laser, but always in predictable places. They issue many warnings.

Williamson county uses Ka.
Washington county uses Ka. Hidden light bars, but marked.
Austin county uses Ka, dual Stalkers. Hidden light bars, but marked cars.
Bastrop County uses K.