Further to the answer of 14 November 2007, Official Report, columns 293-4W, the research sources are as follows:
‘Research evidence suggests that about 1 in 5 men and fewer than 1 in 10 women, who had used at least one of six drugs (cannabis, heroin, illicit methadone, amphetamine, crack and cocaine) reported first using one of them in prison’.
(a) ‘Substance misuse among prisoners in England and Wales: Further analysis of data from the ONS survey of psychiatric morbidity among prisoners in England and Wales carried out in 1997 on behalf of the Department of Health.’
(b) Nicola Singleton, Michael Farrell, Howard Meltzer
‘Research also shows that the level of drug misuse falls dramatically compared with use prior to imprisonment’.
(a) “Changing levels of drug use before, during and after imprisonment” in ‘Prisoners’ drug use and treatment: seven research studies’ (Home Office Research Study 267) Malcolm Ramsey (ed)
(b) Tony Bullock
(c) July 2003