23 Selected topics from 2019 A restraint bed in a prison is demonstrated to the NPM. Neither the Execution of Sentences Act nor the Regulations define a duty of supervision. The guide­lines as amended in March 2019, now require continuous supervision by prison officers.18 The Correctional Service's guidelines previously specified that prison officers needed to check on inmates placed in restraints at a minimum of once per hour. Use of restraint beds in Norwegian prisons Figures for the last six years (2013–2018) There are currently 31 high-security prisons in Norway. Of these, 18 have a restraint bed.19 None of the prisons have more than one restraint bed. The prisons have stated that restraint beds in the period 2013–2018 were used a total of 82 times for 51 persons. During that same period, the figures have varied between 8 and 20 times per year nationally. In the past two years (2017 and 2018), restraints have been used 15 and 13 times respectively. 18 Directorate of Correctional Service (2002). Guidelines to the Execution of Sentences Act and its Regulations, section 38.7. Revised version of 15 March 2019. 19 One of the prisons stated that it had an old restraint bed in the prison, but that the prison decided in 2016 to stop using it due to its age and standard. Another prison stated that its restraint bed is not approved, as is required, and has therefore never been used. The Directorate of Correctional Service has also stated that Arendal Prison, Evje Section, has ordered a new restraint bed.