Currently, the responsibility for regulating these incidents falls upon the states, which vary widely in their enforcement of reporting. As a result of the dangers associated with ionizing radiation, the Centers for Medicare & Medicaid Services (CMS), a part of the U.S. Department of Health and Human Services, will require the accreditation of facilities providing advanced imaging services such as CT, magnetic resonance imaging (MRI), positron emission tomography (PET), and nuclear medicine, in non-hospital, freestanding settings beginning January 1, 2012. The state of California has mandated that facilities that furnish CT X-ray services become accredited by July 1,2013. This California law also requires the documentation of the dose of each CT exam, annual verification of each dose by a medical physicist; and reporting dose errors to patients and physician. In addition, in May, the American College of Radiology (ACR) launched its National Radiology Data Registry (NRDR), a registry database (the General Radiology Improvement Database [GRID]) that compares radiology facilities regionally and nationwide. For the first time, it will be possible to identify weak imaging facilities across the nation and take corrective action.