The AP is reporting that the Obama administration will issue new guidelines for medical marijuana today:

Two Justice Department officials described the new policy to The Associated Press, saying prosecutors will be told it is not a good use of their time to arrest people who use or provide medical marijuana in strict compliance with state law.

While the new guidelines will allow states wide discretion, the memos will also make clear that illegal use of marijuana will not be tolerated and any state sanctioned dispensaries that act as a front for illegal distribution will be dealt with.