(4) The convicted sentenced to life imprisonment cannot be released on probation before he serves at least 25 years of the imprisonment. (5) For the one released on probation, the court may impose a protective supervision, comprised of special measures of assistance, care, supervision or protection implemented by a competent body in accordance with the law. In the cases of convictions for acts of violence, the court may also impose prohibition on attending sports competitions which is enforced by the Ministry of Interior. (6) A juvenile may be released on probation from serving a sentence in juvenile prison if he has served one third of the sentence, but not earlier than one year of the duration of the imprisonment, and if grounds exist to expect that according to the results achieved in correction and reeducation, he would behave well in freedom, continue his education and work, and would not commit crimes in the future. During the probation, the court may determine a measure of intensified supervision, which is to be implemented by the competent court in accordance with the law. Revoking probation release Article 37 (1) The court shall revoke the probation release if during the time the convicted is under probation he commits one or more crimes for which has been sentenced to imprisonment or to juvenile imprisonment longer than two years. 2 (2) The court may revoke the probation release if the person on probation commits one or more crimes for which an imprisonment or juvenile imprisonment of up to two years has been pronounced or if after two written warnings from the competitive body, fails to fulfill the obligations from the protective supervision (Article 36 paragraph 5). In the assessment whether it shall revoke the probation, the court shall especially take into consideration the similarity of the committed crimes, their significance, the motives of their commission, and other circumstances that point to the justification for revoking the probation. (3) When the court revokes the probation release, it shall impose a sentence by applying the provisions referred to in Articles 44 and 46, paragraph 2, taking the previously imposed sentence as already confirmed. The part of the punishment that the convicted has already served according to the previous sentence shall be calculated into the new sentence, and the time passed on probation shall not be considered. (4) The provisions referred to in paragraphs 1, 2 and 3 shall be applied also when the person on probation is tried for a crime committed prior to being released on probation. 14/217