San Francisco Chronicle:  “Colorado and California are among the 16 states that, along with the District of Columbia, have laws permitting marijuana use for medicinal purposes. But while each of the laws conflicts with federal law, Colorado and California represent case studies in the varying degrees of U.S. law enforcement response. . . . But that’s a light dusting compared with the enforcement actions directed by U.S. attorneys in California, which include letters to landlords threatening forfeiture, IRS letters seeking back taxes and telling medical marijuana businesses they can’t deduct expenses, and DEA raids on dispensaries and marijuana ‘grows.’  The varying reactions of U.S. attorneys in the two states may be attributable to the level of state regulation of the medical marijuana industry – or lack of it.”