Workplace drug testing for marijuana may need updating in light of changing laws, a case before the Colorado Supreme Court suggests. Kai-Huei Yau/MCT/Landov hide caption

itoggle caption Kai-Huei Yau/MCT/Landov

One of the scariest parts of advanced macular degeneration can be losing the ability to read facial expressions. Maria Pavlova /iStockphoto hide caption

itoggle caption Maria Pavlova /iStockphoto

Among heroin addicts who are able to quit, 40 to 60 percent relapse within the first year — many within the first weeks of release from a treatment program. Diane Diederich/iStockphoto hide caption

itoggle caption Diane Diederich/iStockphoto

Truvada, an FDA-approved drug to help prevent HIV infection, is among the AIDS drugs that fill pharmacy shelves at the Whitman-Walker clinic, a Washington, D.C., community health center. Astrid Riecken/MCT/Landov hide caption

itoggle caption Astrid Riecken/MCT/Landov