XIX International AIDS Conference in Washington D.C. Session on drug policy with speakers from the political and scientific community. They talk about harm reduction and political leadership. Chaired by Christopher Beyrer from John Hopkins University.

Helene Gayle is an AIDS expert who has been working in many different initiatives in the US, among them the Centers for Disease Control (CDC). She also works in President Obama's advisory group on HIV/AIDS. Here she talks about understanding and changing behaviors.