Eric Holder, the Attorney General of the United States, said that he intends to issue a statement to clarify the position of the United States with respect to when it will prosecute people who comply with state legal medical marijuana laws.

See also “AG Says Feds Will ‘Work With’ States On Medical Marijuana,” which says

“U.S. Attorney General Eric Holder said on Thursday that the Justice Department will work with governors and other state officials to reach a ‘satisfactory resolution’ to the establishment of medical marijuana dispensaries in states with medicinal cannabis programs.  ‘We are in the process of working [on] these issues with the U.S. Attorney for Rhode Island and other U.S. Attorneys across the country,’ Holder said”