There may be no police investigation. OP said it was sent to the police. OP didn't say the police did anything about it. Just because the police get a referral doesn't mean they do anything about it. No case. No detective assigned to it.
I still would like to know what this has to do with caregiving. I think the poster might be better of finding a legal forum with a section on criminal issues.
The post is tagged with elder abuse and family caregiver. There are plenty of posts from people who are seeking legal and tax advice & who would be better off posting elsewhere but no one says a thing about it.
I don't think people are reading this right. There may not even be a case opened at the police department. OP said a case was opened and sent to the police department. So it sounds like it was a APS case that was opened and referred to the police. Just because they sent a referral to the police doesn't mean the police will do anything about it.