PART XII
Procedure in criminal cases in international relations
Chapter 62
Judicial assistance and service of documents in criminal cases
Article 589a. ยง 1. With respect to a person deprived of liberty within the territory of a foreign state, extradited temporarily in order to testify as witness or to conduct other procedural action with his participation before a Polish court or state prosecutor, the circuit court for the place of the performance of the action shall order placing the extradited person in a Polish penal establishment or detention facility for the period of his stay within the territory of the Republic of Poland, but not exceeding the term of deprivation of liberty specified in the state which extradited the person.
EDIT.