A study published in Psychiatric Services found that overall availability of nursing home-based mental health services failed to improve after the implementation of the Omnibus Budget Reconciliation Act of 1987 (OBRA).   Though OBRA requires nursing homes to detect and treat mental illness among residents, data from 1995 through 2004 show that roughly 80 percent of facilities provided on-site mental health services in each survey year.  The study also found that facilities were more likely to provide mental health services if they were larger, in metropolitan areas, or in the Northeast region. 

Li, Y. (2010). Provision of mental health services in U.S. nursing homes, 1995–2004. Psychiatric Services, 61: 349-355. doi: 10.1176/appi.ps.61.4.349
http://psychservices.psychiatryonline.org/cgi/content/abstract/61/4/349