National Preventive Mechanism Tenth Annual Report 2018–19 NPS New psychoactive substances OSCE Organization for Security and Co-operation in Europe Ofsted Office for Standards in Education, Children’s Services and Skills OPCAT Optional Protocol to the Convention against Torture and other Cruel, Inhuman or Degrading Treatment or Punishment PACE Police and Criminal Evidence Act 1984 PSI Prison Service Instruction PPO Prisons and Probation Ombudsman PSO Prison Service Order RQIA Regulation and Quality Improvement Authority SHRC Scottish Human Rights Commission SPT United Nations Subcommittee on Prevention of Torture and other Cruel, Inhuman or Degrading Treatment or Punishment SCH Secure children’s home STC Secure training centre YOI Young offender institution 62