Correctional institutions Moreover, it was worthy of criticism that there were no standards of care and no criteria for classifying inmates who are not suited for imprisonment with the general population due to psychological ideosyncrasies. Standards must be created Therefore, the NPM recommended that these persons receive particularly intensive and specialised care and therapy. National standards must be established for the care of inmates who suffer from mental impairment. Moreover, classification criteria must be developed. Likewise, it was recommended that consideration be given to how and where to best house such inmates who need intensive care. Supervisory review initiated The NPM’s criticism led to a supervisory review of the living conditions of these inmates. A working group for this purpose was established at the Federal Ministry. This working group developed care guidelines for prison inmates who are not suited for housing with the general prison population due to psychological idiosyncrasies. This was in line with the NPM’s recommendation to establish standards for the treatment and care of these inmates. In addition, criteria were defined as guidelines for the classification of these persons. In the future, the correctional institution should document special treatment and care requirements and the reasons for initiating, maintaining and terminating this form of detention. Accurate detection De facto, the review of living conditions led to a significant reduction in the number of prison inmates held in accordance with Section 129 of the Penitentiary System Act nationwide. By mid-2017, it was fewer than ten persons. The term „psychological idiosyncrasy“ is not precisely defined The NPM also pointed out that the term “psychological idiosyncrasy” (“psychische Besonderheit”) used in Section 129 of the Penitentiary System Act is imprecise. This vagueness raises constitutional law concerns. The Federal Ministry promised that the working group would evaluate the statutory provision. There were still no results at the time of completing this report. XX  Prison inmates with mental idiosyncrasies who are unsuited for housing with the general prison population must receive adequate specialised care and therapy. XX  Prison inmates with psychological idiosyncrasies who are unsuited for housing with the general prison population must be separated from the other prison inmates. XX  Standards for care and treatment of these prison inmates must be established along with criteria providing guidance for their classification. 116