He ain’t thin.
He may be spotted by aerial sensors that can pick up body heat (particularly at night), urine, motion, even noise. And there could be wildlife cams...
They keep tracking bloodhounds at prison he was allowed to leave. Guards opened doors for him, they claim he fooled them by wearing clothing similar to guards’ uniform. Bloodhounds tracked his scent for about a quarter mile, and then it rained really hard and no more trail. It’s hot and humid, not too many mosquitos but ticks will eat you alive. Terrain is amazingly rugged, heavily wooded, lots of water to cross, streams and white river. Pretty hilly, lots of caves. If he’s still in Arkansas it will be nearly impossible to find him in the woods.