CHAPTER II
PROTECTION OF FUNDAMENTAL RIGHTS AND FREEDOMS OF THE INDIVIDUAL
PROTECTION OF RIGHT TO PERSONAL LIBERTY.
5.- 2. any person who is arrested or detained shall be informed orally and in writing as soon as reasonably practicable, in language that he understands, of the reason for his arrest or detention.
Language
Rights during investigation - arbitrary arrest or detention and deprivation of liberty
Rights during investigation - informed of belief that crime has been committed
Rights during trial - interpretation and translation
EDIT.