One of Scotland's youngest ever killers died behind bars after taking the street drug Spice, a sheriff has ruled.Murderer Thomas Shields passed away as a result of taking the synthetic cannabinoid known as a "zombie" drug.Shields, 30, was being held at HMP Castle Huntly and had been preparing for release when he died in October 2017.A fatal accident inquiry at Perth Sheriff Court was told the drug 5F-mdmb-Pinaca was first identified in Hungary in 2014 and was used by prisoners because it did not show up in random drug tests.The probe heard prison bosses admit they could not completely stop prisoners from smuggling contraband into the jail.The inquiry was told there were around 170 inmates in the prison but as many as 100 could be out on
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