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He said that in his 36 years on the job, drug use had changed from cannabis and heroin to psychoactive substances.

Jake says he spent all day locked in his cell and began using spice, a psychoactive substance, which was sprayed onto sheets of paper and slid under the door.

Prison staff had gathered intelligence suggesting he was selling psychoactive drugs to other inmates, and a "debt list" believed to show those who owed him money was found in his cell.

In Newman’s real life, it was a psychoactive psilocybin mushroom that, like all of them, stains blue when bruised.

In a snow-covered village on the northern outskirts of Moscow, Russia’s most famous mycologist, Mikhail Vishnevsky, poured me a cup of light psychoactive mushroom tea.