5 Principle 23 1. The duration of any interrogation of a detained or imprisoned person and of the intervals between interrogations as well as the identity of the officials who conducted the interrogations and other persons present shall be recorded and certified in such form as may be prescribed by law. 2. A detained or imprisoned person, or his counsel when provided by law, shall have access to the information described in paragraph 1 of the present principle. Principle 24 A proper medical examination shall be offered to a detained or imprisoned person as promptly as possible after his admission to the place of detention or imprisonment, and thereafter medical care and treatment shall be provided whenever necessary. This care and treatment shall be provided free of charge. Principle 25 A detained or imprisoned person or his counsel shall, subject only to reasonable conditions to ensure security and good order in the place of detention or imprisonment, have the right to request or petition a judicial or other authority for a second medical examination or opinion. Principle 26 The fact that a detained or imprisoned person underwent a medical examination, the name of the physician and the results of such an examination shall be duly recorded. Access to such records shall be ensured. Modalities therefore shall be in accordance with relevant rules of domestic law. Principle 27 Non-compliance with these principles in obtaining evidence shall be taken into account in determining the admissibility of such evidence against a detained or imprisoned person. Principle 28 A detained or imprisoned person shall have the right to obtain within the limits of available resources, if from public sources, reasonable quantities of educational, cultural and informational material, subject to reasonable conditions to ensure security and good order in the place of detention or imprisonment. Principle 29 1. In order to supervise the strict observance of relevant laws and regulations, places of detention shall be visited regularly by qualified and experienced persons appointed by, and responsible to, a competent authority distinct from the authority directly in charge of the administration of the place of detention or imprisonment. 2. A detained or imprisoned person shall have the right to communicate freely and in full confidentiality with the persons who visit the places of detention or imprisonment in accordance with paragraph 1 of the present principle, subject to reasonable conditions to ensure security and good order in such places. Principle 30 1. The types of conduct of the detained or imprisoned person that constitute disciplinary offences during detention or imprisonment, the description and duration of disciplinary punishment that