A randomized controlled trial of a Group psychological intervention to increase locus of control for alcohol consumption among Alcohol-Misusing Short-term (male) Prisoners (GASP).

A clinical psychologist-facilitated group intervention did not have a statistically significant effect on sense of control of drinking behaviour among men with pre-imprisonment alcohol misuse serving less than 2 years in a South Wales prison. The study proved coterminous, however, with 40% prison staff cuts which seem likely to have contributed to the high loss of group sessions and possibly overwhelmed any treatment effect. Intervention completion failures, previously cited as harmful, had no effect here, so the trial should be repeated when the prison climate improves.