Are Alzheimer's patients supposed to be segregated from other patients at an assisted living facilitly?

My 80+ parents have lived in an assisted living community for nearly a couple of years without any incident caused by other residents. However, this place accepted a permanent patient who has Alzheimer's a few months ago. This facility was recommended by an ElderCare advisor from A Place for Mom. Per their records, it can accommodate mild dimentia, but no wanderers. This patient once went into their room and rifled through their personal effects and that incident totally terrified my parents. She struck again, where she peed in the doorway of my parents' room yesterday morning. It was the word of the nightshift worker against my mom, who was so tearful and distraught about the entire incident. This worker claimed that she didn't see any pee and the Alzheimer patient was found in her bed with a dry diaper. If she did pee, that would account for dry diaper. I was assurred by the facility that this patient is constantly supervised. My parents are straight shooters,they tell things like it is. They would not conspire a story about her peeing in their doorway and cause all kinds of trouble. I understand that such facility would be governed under Title 22 but looking at the rules and regulations would make your eyes cross. If this kind of facility accepts Alzheimer's patients, should they segregate such patients from the rest of the residents? As a result of yesterday's pee incident, they moved this patient to the other end of the building. She used to be in the room next to my parents. Do I have any recourse on behalf of my parents? Do I have a right to demand that they install security cameras in the hallway? (The facility was pushing back saying it was a privacy issue, but the hallway is a public area.) Apologies for the wordiness of this question, but thought the more background that I provide to these pointed questions, the more it would assist in the response. Thank you!