King County, Wash., designed its Familiar Faces initiative to better serve high utilizers in the community.  King County defined high, or frequent, utilizers as individuals who have been booked in jail four or more times in a 12-month period and have a mental illness and/or substance abuse disorder.  This population was selected as the focus of the initiative with the idea that improving the health and social outcomes of this group would result in a more meaningful understanding of the types of opportunities that the Affordable Care Act and Medicaid expansion makes possible for a community.