Section 136 provides the lawful authority for the removal, by the police, of the person to whom the provision applies, from a place to which the public have access. There has been a longstanding debate as to the most appropriate place of safety for these patients. The aim of this article is to review the literature and determine the ideal place for the detention and assessment of these patients and clarify the responsibilities of the staff of the agencies involved in the detention. It concludes that there is no single most appropriate place of safety for all groups of patients. Rather, there should be a range of options to enable the assessment in the most suitable environment for individual cases according to their needs at the time.