Medina County has lots of deer breeders and high-fenced hunting operations. CWD was found in one of the breeder's pens and on an adjoining ranch where a three year old hunter harvested buck tested positive. That pasture was in Uvalde Co. One other buck from the same Medina Co. breeder showed up in a pen on a Lavaca county ranch.
The Medina Co. check stations are for hunter harvested deer, free range or otherwise, from ranches not already required to submit samples for testing. It's voluntary and free to have your deer tested. The technicians will want the brain stem and adnoids from your deer.