To most of the public, the widespread availability of illegal drugs in prisons must be hard to comprehend. A Ministry of Justice that cannot prevent law-breaking within its own institutions is clearly failing to a disastrous extent. As well as undermining rehabilitation by perpetuating criminality, addiction and debt, drug dealing in prisons undermines the whole system’s credibility and purpose.

Yet this is the situation in multiple English and Welsh jails, as set out by chief inspector Charlie Taylor. His last annual report highlighted the fact that 39% of prisoners surveyed in 2024/25 said it was easy to obtain drugs, while 19% of female prisoners had developed drug problems in jail. The rate of positive results in random drug tests regularly topped 30%.

These are disturbingly high figures and Mr Taylor did not conceal his frustration when he told the Guardian that the government has been “very slow” to address the threat from drug dealers using........

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