Kristie West was driving down the highway in rural South Texas when she saw it. The drive from her ranch to the nearby town of Poth was usually uneventful. But on that day in 2017, West saw something that made her slam on the brakes of her pickup. A white plastic bag had flitted into a horse pen behind a house where a young palomino was grazing. Someone who doesn't work with livestock probably wouldn't have thought twice about it. But West trained horses, and she knew the colt would treat the bag like a toy...
