FIRST BOOK - General Provisions
PART FIVE - Interview and interrogation
CHAPTER TWO - Procedure of interview or interrogation
Procedures forbidden during the interview and interrogation
Article 148 – (1) The submissions of the suspect or accused shall be stemming from his own free will. Any bodily or mental intervention that would impair the free will, such as misconduct, torture, administering medicines
or drugs, exhausting, falsification, physical coercion or threatening, using certain equipment, is forbidden.
EDIT.