it could happen (black jag) in southern Arizona/New Mexico or south TX, but you'd have better odds of winning the lotto.
Never personally seen one and don't believe in the black cat theory either. There was a mountain lion killed in East, TX maybe 15 years ago just outside of Jasper which is near the Lousiana border.
While working in South, TX I did see a Jaguar mounted on a fireplace hearth that supposidly was killed on the ranch. Perhaps a 100 or more years ago.
