Chapter II
THE FREEDOMS, RIGHTS AND OBLIGATIONS OF PERSONS AND CITIZENS
PERSONAL FREEDOMS AND RIGHTS
Article 41
2. Anyone deprived of liberty, except by sentence of a court, shall have the right to appeal to a court for immediate decision upon the lawfulness of such deprivation. Any deprivation of liberty shall be immediately made known to the family of, or a person indicated by, the person deprived of liberty.
Rights during investigation - arbitrary arrest or detention and deprivation of liberty
EDIT.