Russell Brand told the MPs in April: “Penalising people for possession of drugs is expensive. The costs would be better spent, I think, on education and treatment.
“Making it illegal isn’t working anyway. Being arrested isn’t a lesson, it’s an administrative blip.”
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Greater Manchester Police said "inquiries are ongoing to fully understand the circumstances of the incident."
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The former leader said the party needed to learn lessons after his successor Paul Nuttall failed to unseat Labour in a hard-fought campaign.