A sign for the Berkeley Patients Group, founded in 1999 and slated to close by May 1, 2012.
Since last fall, hundreds of medical marijuana operators have gone out of business amid a statewide crackdown by federal prosecutors. In many cases the feds haven't gone after operators themselves, but their landlords. Now, one of California's biggest medical marijuana establishments -- embraced by local officials as a model business that donates to the poor and pays millions in taxes -- has become the feds' latest target. Reporter: Michael Montgomery
Our story was co-reported by David Downs and produced in collaboration with California Watch.