yeah, that is scary. I do know in Canada they hold patients in the hospital for extended time before they are placed. Here they are rarely held for extended time. We don't have the issue of mix gender that you seem to have. The elderly is also not usually kept in the same area with younger residents. Yet we all need to be aware of the potential for abuse of elderly loved ones with cognitive impairment.
Beyond that be warned that abuse by care givers is possible. I just had a care giver fired for what I considered abuse. Not only did she jerk Mom's arm with me sitting beside Mom, but after I spoke to her and warned her not to do that ever again to anybody, she did it to another resident with me watching. Be watchful of the interaction and do not accept less than the best.
Beyond that watch the reaction of your loved one to their care givers. They may not be able to communicate or remember but the basal parts of the brain will register when somebody hurts them. This is part of our basic instincts that don't leave easily until the brain stem, which is the last to go, is affected. If there is a voice that causes your loved one to recoil then check it out. If there is one care giver that they fight with then check it out. Your loved one may not be able to verbally communicate with you but their reactions are communication none the less.
Example... My Mom, to this day, will break out in a huge smile when the old Rem Coordinator speaks to her. This is a dear lady with love and compassion and Mom remembers that. She doesn't know her name but she knows how she feels. Mom always frowned and mumbled incoherent sounds that let you know she didn't like the last Rem Coordinator. The lady had no compassion and it was just a job that she didn't do well. Amazingly it was Mom's reaction that validated my feelings about this lady
Now that she is gone.. yep gone gone gone
... I am hoping for something better. When Mom smiles at her I will know we have a good one!