Legal Weed: Federal laws

A May series on marijuana concludes with final thoughts on the federal ban now that the drug is legal in two states. Mark Kleiman, professor of public policy at the UCLA School of Public Affairs, marijuana legalization consultant for Washington State, and co-author of Marijuana Legalization: What Everyone Needs to Know (Oxford University Press2012) explains how he thinks state and federal law could be reconciled, and takes your calls.