When will Pete Doherty go to jail?

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Crackhead Pete Doherty was arrested for the nth time for drug possession. He was stopped by the police in London on Monday morning after spending the weekend performing at the V Festivals in Essex and Staffordshire. A policespokesman confirms, "A 28-year-old man was arrested in east London on suspicion of possession of drugs. He is in custody at an east London police station." Perhaps, this is Pete's way of grieving over his split with Kate Moss? But seriously, he's been arrested for several times already, so when is this crackhead going to jail? Anyone here knows anything about the laws and punishments regarding possession of drugs?