Feds Say CA Medical Pot Dispensaries are to be shut down

Wait a minute?  The Federal Government is now able to police its citizens?  How growing medical Marijuana for Patients is a Federal Matter?  Don't the FEDS realize they are just going to absolutely Cripple Our Economy, if they remove the 2 Billion dollars a year industry.  Our State Troopers and Local  Police should do their part in defending its Citizens, proctect us from Federal Officers infringing on our State Laws, which is Our Police's Duty to serve and protect our way of life/!!!