This controversial issue is now becoming about States' Rights.

From the Associated Press:

Eight former DEA chiefs say the clock is ticking and the federal government needs to act now to nullify Colorado and Washington's laws legalizing recreational marijuana use. The onetime DEA heads are issuing joint statements today saying the Obama administration has reacted too slowly and should immediately sue to force the states to rescind the legislation.

The former heads say the Washington and Colorado laws will create a "domino" effect that will result in numerous other states approving similar recreational marijuana laws.

Former DEA (Drug Enforcement Agency) Head Peter Bensinger fears the "Do Nothing, Say Nothing" approach taken by the federal government will allow these laws to become fully implemented, At that point, it will be far more difficult for the government to undo the legislation.

Washington hopes to have its marijuana stores up and running by December. The former DEA leaders issued their statement the same day the United Nations' International Narcotics Control Board came out in favor of the government suing the states to get the laws nullified. The INCB has no enforcement power, however.