and recommended that the Public Prosecutor-General issue a warning to the chief of the Special Investigation Headquarters and conduct an education session to prosecutors on principles of the Constitution and relevant regulations which should be complied with when they summon and interrogate suspects, including night-time questioning. 3) On-site Survey of Police Lockup Facilities Pursuant to Article 24 of the National Human Rights Commission Act (on-site survey of facilities), the Commission visited lockup facilities located inside 18 police stations nationwide to inspect human rights conditions in the amenities provided in the lockup facilities and treatment of inmates to come up with improvement measures. It made thorough preparation in advance by clarifying investigative scope based on pattern analysis of existing complaint cases and attempted to minimize a grey area by selecting regions from which few complaints originated. The investigation was designed to identify fundamental causes of complaints, prevent them in advance, and seek effective solutions by examining the implementation of past recommendations in the field. The investigation group was consisted of diverse experts from academia and judiciary communities, as well as professional investigators. The on-site investigation was an opportunity not only to review documents, but also to conduct face-to-face interviews with staffs and inmates to gather their opinions for improvement. The Commission also held a meeting with the police station staff and recommended that they should improve inmate treatment, facilities and environment in the detention facilities. Chapter 3. Investigations and Remedies: Civil Rights Violations 75