Addiction advocates in Philadelphia are gearing up for a fight with federal law enforcement over a so-called supervised injection site, where drug use can take place in the presence of medical professionals.Produced, edited, and narrated by Mark McDaniel.

Solitude by Jahzzar. (CC BY-SA)

Ghosts 02, 09, and 13 by Nine Inch Nails. (CC BY-NC-SA)

Photo Credits:

KEVIN DIETSCH/UPI/Newscom

BERSAK DANIEL/SIPA/Newscom

Douglas Graham/Loudoun Now/Newscom

Kris Tripplaar/Sipa USA/Newscom

MOLEKUUL/SCIENCE PHOTO LIBRARY/Newscom

Bernard Weil/ZUMA Press/Newscom

Bastiaan Slabbers/ZUMA Press/Newscom

Bill Greenblatt UPI Photo Service/Newscom

MICROGEN IMAGES/SCIENCE PHOTO LIBRARY/Newscom