Related Rule
Argentina
Practice Relating to Rule 161. International Cooperation in Criminal Proceedings
Section C. Extradition of own nationals
Argentina’s Law on International Cooperation in Criminal Matters (1997) provides that if the person for whom extradition is sought has been an Argentine national since the time the crime was committed (and is still an Argentine national at the time of the option), such person may opt to be tried by Argentine courts, unless a treaty obliging the extradition of its nationals applies. If the Argentine national chooses to exercise this right, extradition is denied and the case is tried in Argentina under Argentine penal law, so long as the requesting State gives its consent and renounces its jurisdiction, and hands over the relevant records and evidence. 
Argentina, Law on International Cooperation in Criminal Matters, 1997, Article 12.