The Obama administration is reportedly considering legal action to halt Colorado and Washington’s recent ballot initiatives legalizing recreational use of marijuana. Both measures allow for possession of up to one ounce of marijuana, presenting a clash with federal law. According to the New York Times, the White House and Justice Department have held high-level meetings since the ballot measures were approved on Election Day one month ago. Washington’s law went into effect on Thursday at midnight. In Seattle, hundreds of marijuana enthusiasts gathered near the city’s Space Needle tower for a celebratory rally.