Last week, the U.S. Drug Enforcement Administration once again decided that marijuana has no medical use and left it classified as a Schedule I drug in the federal Controlled Substances Act.

The announcement did relax rules for marijuana research to make it easier for institutions to grow marijuana for scientific study.

The DEA currently authorizes just one grow facility in Mississippi.

As Californians consider whether to legalize recreational use of marijuana – Proposition 64 is on the November ballot – how will this decision affect California and other states that have passed similar measures in opposition to the federal government?

University of the Pacific McGeorge School of Law Professor Michael Vitiello joins us on Insight to explain.