PART I
Fundamental rights and duties
CHAPTER TWO
Rights and Liberties
SECTION 1
Fundamental Rights and Public Liberties
Article 17 - Right to personal freedom
1. Every person has a right to freedom and security. No one may be deprived of his or her freedom except in accordance with the provisions of this article and in the cases and in the manner provided by the law.
2. Preventive detention may last no longer than the time strictly required in order to carry out the necessary investigations aimed at establishing the facts; in any case the person arrested must be set free or handed over to the judicial authorities within a maximum period of seventy-two hours.
3. Any person arrested must be informed immediately, and in a manner understandable to him or her, of his or her rights and of the grounds for his or her arrest, and may not be compelled to make a statement. The arrested person shall be guaranteed the assistance of a law¬yer during police and judicial proceedings, under the terms established by the law.
4. A habeas corpus procedure shall be regulated by law in order to ensure the immediate handing over to the judicial authorities of any person arrested illegally.
Likewise, the maximum period of provisional imprisonment shall be stipulated by law.
Fair trial standards
Rights during investigation - arbitrary arrest or detention and deprivation of liberty
EDIT.