prison visitor
person who visits prisons to befriend and monitor the welfare of prisoners in general (not a person who visits a specific prisoner to whom they have a prior connection)
en-GB/ˈpɹɪzn ˈvɪzɪtə/
en-US/ˈpɹɪzən ˈvɪzɪtɚ/
person who visits prisons to befriend and monitor the welfare of prisoners in general (not a person who visits a specific prisoner to whom they have a prior connection)