RT Article T1 An overview of the hallcrest report: a study of private security and police resources and relationships in the United States JF Nouvelles technologies et justice penale SP 500 OP 516 A1 Cunningham, William C. LA English YR 1988 UL https://krimdok.uni-tuebingen.de/Record/1467912034 K1 Private Sicherheitsdienste K1 Polizei K1 USA