I think that's quite accurate. One of the difficulties is that the workers are reluctant to report, for a number of reasons—the paperwork, the blame that gets assigned to them, a desire to protect the residents, and a culture that suggests that this is normal, that if you sign up as a PSW in long-term, you're going to get bitten, scratched, punched, or whatever.
On November 1st, 2011. See this statement in context.