Artikel 12

1. A witness or expert, whatever his nationality, appearing on a summons before the judicial authorities of the requesting Party shall not be prosecuted or detained or subjected to any other restriction of his personal liberty in the territory of that Party in respect of acts or convictions anterior to his departure from the territory of the requested Party.
2. A person, whatever his nationality, summoned before the judicial authorities of the requesting Party to answer for acts forming the subject of proceedings against him, shall not be prosecuted or detained or subjected to any other restriction of his personal liberty for acts or convictions anterior to his departure from the territory of the requested Party and not specified in the summons.
3. The immunity provided for in this article shall cease when the witness or expert or prosecuted person, having had for a period of fifteen consecutive days from the date when his presence is no longer required by the judicial authorities an opportunity of leaving, has nevertheless remained in the territory, or having left it, has returned.