The fairness of treatment can be inferred from 2 aspects of the relationship between authority and other party: the person-related aspect and the role-related aspect. One hundred seventy-five American detainees were interviewed about their encounters with police officers and correctional officers. The role-related aspect affected procedural fairness judgments most when first-time incarcerated detainees evaluated the encounter with police officers. The person-related aspect affected procedural fairness judgments most when first-time detainees and repeatedly incarcerated detainees evaluated encounters with correctional officers. Consequences for the group value model of procedural fairness as well as for the legal practice are discussed.