Final answer:
The parole board decisions mentioned in the question are from the United States, as indicated by references to its common-law legal system and significant Supreme Court cases.
Step-by-step explanation:
The introductory example discussing parole board decisions likely refers to a country with a common-law legal system due to the references to specific U.S. Supreme Court cases and the parole board's role within such systems. The United States, with its common-law system, is well known for its parole board processes and has been the subject of landmark Supreme Court decisions, such as Gideon v. Wainwright and Miranda v. Arizona, which influence the criminal justice system significantly.
Moreover, the reference to the modern American civil rights movement and America's specific criminal justice policies, including its approach to the war on drugs, suggest that the United States is the country in question regarding parole board decisions.