CHAPTER 2 Fundamental Human and Civil Rights and Freedoms
Article 42. A person shall not be compelled to be a witness against himself or herself or against his or her spouse, or against a close relative. The law may foresee other circumstances relieving a person from the obligation to testify. Illegally obtained evidence shall not be used. A punishment may not exceed that which could have been met by the law in effect when the crime was committed. A person shall not be considered to be guilty for a crime if at the time of its commission the act was not legally considered a crime. Laws limiting or increasing liability shall not have retroactive effect.
Non-retroactivity
Rights during investigation - self incrimination
Nullum crimen sine lege
Nulla poena sine lege
EDIT.