A number of states have adopted laws that allow medical use of marijuana. Federal law, however, does not recognize any accepted medical use for marijuana & individuals remain subject to federal prosecution for marijuana possession. Debate continues over the medical effectiveness of marijuana, & over government policies surrounding medical use. This report examines the implementation of medical marijuana laws in selected states: Oregon, Alaska, Hawaii, & California, because they had medical marijuana laws in effect for at least 6 months & some data was available on patient & physician participation. Also discusses the Supreme Court's decision in U.S. v. Oakland Cannabis Buyers' Cooperative.Jones, Paul is the author of 'Marijuana Early Experience With Four States' Laws That Allow Use for Medical Purposes' with ISBN 9780756729912 and ISBN 0756729912.