Introduction -- Social and moral connections -- Design of the study -- Trends and trajectories -- 25 years of public confidence in the police -- 25 years of public contact with the police -- Why do people trust the police? -- What is trust? -- Mass media -- Social ecology -- One type of contact: being approached by the police -- A focus on a special population -- Another type of contact: reporting crime -- Why do people grant the police legitimacy? -- What is legitimacy? -- Social ecology -- Procedural justice and contact with the police -- Why do people cooperate with the police? -- Cooperation and the portability of procedural justice -- Revisiting a special population -- Conclusions.