In England we now have VAUs (Vulnerable Adult Units) which are made up of specially trained police officers. They work in conjunction with people like me ( Joint Trained Investigators) from Social Services and we take all reported cases very seriously indeed with a very clear and timely set of procedures designed first to protect and then to prosecute, if appropriate.
I know that doesn't help you, Susan, but I would be really interested to hear how it works in the States.