Report on the Performance of Activities of the National Preventive Mechanism for 2015 such measures are further limitations of prisoners’ rights, this is certainly a positive thing, but nevertheless, the shortcomings and inconsistencies that have been found have to be remedied as soon as possible. Most inconsistencies were found in the implementation of the measure of isolation from other inmates. While in some penal institutions this measure is implemented by putting inmates in a single room for a period of 30 days as a rule, in others it is implemented in a section of the corridor separated by bars, where the inmate gets a mattress brought in if the measure lasts overnight. This is the case, for example, in Osijek County Prison. Such treatment is contrary to international standards and it can be considered degrading treatment. There are further inconsistencies also in the giving of orders to implement this measure, so in some penal institutions there is no written decision on isolation, in some an order is issued for implementation of the measure, while in others a There are great differences in the written decision is made, although this is not frequency of ordering the measure of prescribed by the EPSA. In addition to that, in isolation from other inmates, which Lepoglava State Prison and in Šibenik State and indicates that there are inconsistent County Prison, the written decision also contains an criteria for its implementation. For instruction on legal remedy, which is certainly an example, in Osijek County Prison, example of good practice. There are great which has a capacity of 110 persons, in differences in the frequency of ordering this 2014 there were 44 orders for measure to be implemented, which indicates that isolation, while in Zagreb County there are inconsistent criteria for its Prison, which has a capacity of 626 implementation. For example, in Osijek County persons, this measure was not Prison, which has a capacity of 110 persons, in 2014 implemented at all. there were 44 orders for isolation, while in Zagreb County Prison, which has a capacity of 626 persons, this measure was not implemented at all. In several cases, prisoners were separated from the group method of execution of prison sentence for security reasons, although they were not formally the subjects of any particular or disciplinary measure. Such regimen of serving of prison sentence, which sometimes lasts for several months, is implemented by county and state prisons pursuant to the instruction of COPSD. It is undisputed that in some cases the prisoner has to be isolated from group execution of prison sentence, but this has to be decided upon in a legally regulated procedure. Although the measure of accommodation in a specially secured room, free of dangerous objects is ordered very rarely (it was only ordered on 19 occasions in 2015 in the entire prison system), it requires special attention, both due to the empty, sponge-lined room without daylight in which it is implemented and due to the fact that it is often ordered as a result of the prisoner’s pronounced mental disorders. The basic problem definitely comes from incomplete and unclear regulations, which is something we have already written about in our previous reports. For example, it is regulated that this measure can last up to 48 hours on a single occasion, but it is not regulated how long the time interval should be between two instances of implementation of this measure, as is the case with execution of disciplinary measure of 13