According to the provisions on "therapy instead of punishment" (sections 35 to 38) the enforcement authority (usually the public prosecutor) may, with the approval of the court, postpone the execution of a prison sentence or the remainder of a sentence of not more than two years for a maximum period of two years, in cases where the convicted person committed the offence as a result of their addiction to narcotics. Another prerequisite for this postponement is, however, for the convict to be undergoing or firmly determined to undergo addiction rehabilitation treatment.