A report released today by the Partnership for a Drug Free America shows that the number of American teenagers who use marijuana has increased for the first time in 10 years, with 25 percent of teens in grades 9 through 12 saying they’ve used marijuana in the past month, up from 19 percent. What these numbers show—despite what organizations like PDFA might twist them to say—is that our current marijuana policies have clearly failed to reduce teen marijuana use, and a different approach is necessary.…