Once again, federal law enforcement is cracking down on medical marijuana businesses. On Thursday, just as Gov. Chris Gregoire was considering a veto of a bill that would establish the legality of medical marijuana dispensaries in Washington, federal agents raided several Spokane dispensaries. Technically, these actions were in step with the Ogden memo, since Washington’s medical marijuana law does not explicitly allow and regulate dispensaries. Earlier this month, however, U.S. Attorneys warned…