The Appalachian Trail Southern Terminus is 9-10 hours up I-75
Google Maps
Someone just needs to get the word out to AT section/thru-hikers and hostel owners, and he's toast. Info goes up and down the trail super fast. On the trail, long-distance hikers have ALL day to pay attention to whoever else is on the trail, since besides moving their legs, the only other thing they're doing (except maybe eating and taking in an occasional view) is wondering, "Are we there yet?" All evening they're sitting around the campfire, generally with no amusement other than to shoot the breeze with other hikers. And what do they shoot the breeze about? Food and EVERYONE ELSE, including hinky people. On the benign side, it's about telling stories and wondering what's happened to xyz hiker they saw 3 weeks ago. On the safety side, it's who to stay away from, who's a bit strange, who's driving you crazy....
I was actually at a church hostel in Deleware Water Gap where the minister-in-charge's hinky meter registered HIGH, she called LE, and the guy was on the FBI wanted list. IIRC this wasn't a specific thing he did while in the hostel; she sized him up from the way he talked. I did, too (he said he was from Alaska and his name was Iditrod, but he didn't know how to spell it correctly, lol--it's Iditarod), but I had him sized up as a BS-er I wanted to avoid. For her, it was "likely criminal, call the cops".
Bottom line: BL is not going to be able to secrete himself amongst long-distance hikers on the AT. [Day hikers don't have as much time to shoot the breeze about everyone else, don't hang out much, and wouldn't be in a great position to evaluate a random person they came across, unless they were a WS-er, had the guy's portrait inscribed on their brain from being glued to 26 threads, had a full description and color of his pack, knew the diameter of his upper arms as well as his foot size and orientation of his tattoos.....]
IME