ATLANTA — James Lane has a backpack full of syringes slung across his shoulder as he goes to exchange used needles for sterile ones at a small booth set up by an Atlanta needle exchange clinic. The clinic, which operates in an area known as a hot spot for drug use in Atlanta, collects and distributes syringes. It's among just a few of its kind operating publicly in Georgia and a godsend to Lane, who says he turned to heroin and cocaine to self-medicate for post-traumatic stress.