§ Mr. George Howarth
The table sets out the percentages of random mandatory drug test (MDT) samples that have tested positive in each of the last three financial years. It is not possible to attribute any changes entirely to the MDT programme. Supply reduction and treatment programmes also impact on the level of drug misuse in prisons.
Percentage of random mandatory drug tests positive for cannabis, heroin and cocaine Drug type 1996–97 1997–98 1998–99 Cannabis 19.9 16.5 14 Opiates (including heroin) 5.4 4.2 4.4 Cocaine 0.2 0.2 0.3