California, by some estimates, has as many as 350,000 medical marijuana patients -- yet only a tiny fraction has signed on to a state ID card program meant to protect them from arrest or seizure of their medicine. That doesn't appear likely to change, say marijuana advocates, patients and some county health officials who administer the program locally, as the cost of the cards can't compete with privately issued cards or even doctors' recommendations. When the state created the program in 2003 and launched it two years later, officials figured 100,000 patients would sign on for the optional cards, but the state issued just 12,659 to patients and caregivers last fiscal year.