From the Tribune's "Watchdog" story about Illinois nursing homes mixing dangerous felons with the regular senior population:
As of June, the state had identified 3,000 criminals in Illinois nursing homes who had been convicted of felonies including rape, murder and aggravated assault, health department records show. [...]
Just 50 nursing homes in Illinois house more than half of the 3,000 offenders, according to the Tribune's analysis. In Chicago, many of those homes are clustered in a few ZIP codes in Uptown and on the South Side.
[...] the 50 homes accepting the most criminals typically have the lowest staff levels, even though experts call intensive staffing a critical factor in protecting the vulnerable, a Tribune analysis of federal and state data shows.
Federal reports released in July rated 36 of these 50 homes "much below average" or "below average" for overall nursing staff hours. Two were average; 12 had not yet been rated. None was above average.
Check out the graphic (look where all the blue dots are) and the story.