I know that in all the homes I have worked in, if you put a camera in any of the rooms it would be spotted very quickly by staff, most like the cleaning staff that clean the rooms daily, unless it was a tiny button hole camera type, Whilst I think cameras may be an aid to protect people I dont think that in practice they would be effective, especially in a care home, let alone problems of privacy and dignity issues, and there are strict rules and regulations concerning these things n care homes.