PART II. COURT, PARTIES AND OTHER PARTICIPANTS OF CRIMINAL PROCEEDINGS
CHAPTER 6. PARTICIPANTS OF CRIMINAL PROCEEDINGS DEFENDING THEIR RIGHTS AND INTERESTS OR RIGHTS AND INTERESTS OF PERSONS THEY REPRESENT
Article 39. Suspect
(2) Criminal prosecution shall not detain a person as a suspect for more than 48 hours. By the time limit for his detention, the agency for criminal prosecution shall either release the suspect or make the resolution on the institution of criminal proceedings against him [charge him with a crime] and decide on the sanction.
Fair trial standards
Rights during investigation - arbitrary arrest or detention and deprivation of liberty
EDIT.