FILE – In this Feb. 2, 2017, file photo, Gail Groves Scott, bottom left, a health policy fellow in addiction studies at the University of the Sciences in Philadelphia, leads politicians, law enforcement personnel and reporters down a muddy path surrounded by trash and used needles, during a tour of an open-air drug market along Conrail train tracks in the Kensington section of Philadelphia. Philadelphia Mayor Jim Kenney and a representative of railroad operator Conrail announced an agreement Thursday, June 15, 2017, they hope can put an end to an open-air heroin market that has operated for decades along a half-mile stretch of syringe-laden train tracks. (Michael Bryant/The Philadelphia Inquirer via AP, File)