Five disabled residents were moved from St Joseph's home in Newbold Road following a Care Quality Commission (CQC) inspection in May.
The home, run by Aspire Specialist Care Ltd, is now closed.
The CQC said the home's residents were "not protected from abuse that could potentially breach their human rights" and judged it 'inadequate'.
A Derbyshire police spokesman said: "A 49-year-old man from Matlock was arrested on suspicion of assault.
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"He remains on police bail."