 I'm Carl Hart. I'm a board member of Drug Policy Alliance. I'm also a professor at Columbia University. One of the reasons that I enjoy going to the conference is because it brings together a diverse group of people. It brings together law enforcement, along with people who are identified drug users, along with prostitutes, along with academics. It brings together all these different groups and allows us to interact. We all have a single cause and that's to make more evidence-based drug policy.