This is a service that aims to identify people who have mental health problems who come into contact with the criminal justice system before they enter prison. They may be able to liaise and refer people they identify with mental health problems to local services or divert someone out of the criminal justice system, for example by arranging a Mental Health Act assessment. A liaison and diversion service may be in the form of a street triage service (see below) or they can be based in police custody suites or the court cells.