IX. The Judiciary
Article 104
[Deprivation of liberty]
(3) Any person provisionally detained on suspicion of having committed a criminal offence shall be brought before a judge no later than the day following his arrest; the judge shall inform him of the reasons for the arrest, examine him, and give him an opportunity to raise objections. The judge shall, without delay, either issue a written arrest warrant setting forth the reasons therefor or order his release.
Rights during investigation - informed of belief that crime has been committed
EDIT.