Officials send warning letters to property owners and operators of an additional 67 dispensaries, giving them two weeks to comply with federal law.

Los Angeles Times: Federal officials brought their war on medical marijuana dispensaries to Los Angeles on Tuesday, raiding several shops and issuing warning letters to dozens more.

Officials at the U.S. attorney's office said it was the first large-scale federal action taken against cannabis shops in the city, and said more will probably follow. "We couldn't do all of L.A. at once," said Thom Mrozek, a spokesman for the office. "There's just too many stores."