CHAPTER III
RIGHTS AND DUTIES OF THE PEOPLE
Article 34.
No person shall be arrested or detained without being at once informed of the charges against him or without the immediate privilege of counsel; nor shall he be detained without adequate cause ; and upon demand of any person such cause must be immediately shown in open court in his presence and the presence of his counsel.
Fair trial standards
Rights during investigation - arbitrary arrest or detention and deprivation of liberty
Rights during investigation - informed of belief that crime has been committed
Rights during investigation - legal assistance
EDIT.