Scottish prison chiefs are to scrap the compulsory drug testing of inmates after admitting it had failed to tackle rising heroin abuse behind bars.

Prison officers say mandatory random drug tests (MRDTs), which were introduced ten years ago at the height of the so-called "war on drugs", have actually encouraged the use of heroin in jails.
But opposition politicians say the decision shows the Scottish Executive has "thrown in the towel" on eradicating drugs in prisons.