Police arrested Pete Doherty on Monday in east London on suspicion of drug possession.
A police spokesman confirmed a 28-year-old man was arrested on suspicion of possession of drugs and was in custody at an east London police station. Because of police force rules, he could not name the suspect.
Earlier this month, a judge warned Doherty, lead singer of Babyshambles, that he must prove his desire to quit drugs or face a jail sentence for other drug offenses.
Doherty, 28, has admitted possessing crack cocaine, heroin, cannabis and ketamine, as well as to two driving offenses.
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Doherty, best known as on-off boyfriend of model Kate Moss, has been undergoing drug treatment under court order.