State health officials have filed complaints against eight physicians who have recommended nearly half of the 10,000 Arizonans certified to use medical marijuana, saying they failed to check patients' prescription-drug histories, as required. State rules regulating the voter-approved medical-marijuana law require people to obtain a written recommendation from a licensed physician. The doctor must perform a physical exam, review a year's worth of medical records, discuss the risks and benefits of medical marijuana, and review a state database that tracks prescription-drug use.In one case, a naturopathic physician issued recommendations to about 1,000 people but checked the state Board of Pharmacy's controlled-substances database just 56 times, said Will Humble, director of the state Department of Health Services.