Treatability test

The following change made by the Mental Health Act 2007 is relevant:

• Appropriate treatment test replaces treatability test and applies to all patients under long-term detention 3/11/08

The leading case on the test is Reid v Secretary of State for Scotland [1998] UKHL 43.

The test only applied to psychopathic disorder (and, less contentiously, to mental impairment) and stated that treatment must be "likely to alleviate or prevent a deterioration of his condition".