It is a very sad thing to find elderly either abused or neglected and it should be all our responsibility to find out why and, if necessary, bring any wrong doing to light.
One would think it to be a simple task but far from it is more like it. For example, in the State of Illinois there are a bunch of legal forms that must be filled out before you can even set up an interview for a caregiver. Caregivers are associated with some organization which in Chicago can be as many as 30 at last count. From there you contact the organization and try to set up the initial meeting. The whole process can take a month or two.
Point is, various levels of government can be involved or work in the background as umbrella entities. Many times these organizations get state grants, who in turn can get money from federal programs. Things can get really complicated fast.
I recommend before doing anything of a legal nature, you search your loved ones possessions for anything that might look official. You'll probably want to keep an eye out for papers from the state or even organizations you've never heard of. Example is Catholic Charities. (They are like an umbrella that works with the smaller organizations)
Once you have something then its time to rap on the door of the local states attorney- especially around election time cause they sure as shooin do not want any bad publicity when its time to vote. Hope you get the picture.
Forget the local police doing something because the likelihood of it happening is nearly null unless the states attorney gives a directive.
Who's after the states attorney? His/her boss. The State Attorney General.
You need to know your facts though and be able to spit them off your tongue as if they are second nature to you. Get real facts via studies that have been done about elderly, elderly neglect, etc. I imagine AARP has some resources although I haven't check.
All this takes time and I guess 1 year or more would be a quick estimate. Don't give up though. You can make Things happen but you must want to stay the course.
Good luck...