U.S. Attorney General Eric Holder said the Justice Department will announce “relatively soon” its policy on recently passed state measures legalizing the use of marijuana.

“There is a tension between federal law and these state laws,” Holder said in response to questions after a speech at the John F. Kennedy Presidential Library in Boston. “I would expect the policy pronouncement that we’re going to make will be done relatively soon.”

Voters in Washington and Colorado on Nov. 6 approved ballot proposals legalizing possession of up to one ounce of marijuana.

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