KUALA LUMPUR — Every Monday and Thursday morning, the slightly built man rides the bus for an hour and a half from his home on the outskirts of Kuala Lumpur to the Ar-Rahman mosque.

After reciting his prayers, he climbs the stairs to the mosque’s mezzanine level, gives a urine sample and consults a doctor. A pharmacist then gives him a small plastic cup containing methadone, to help wean him from his heroin addiction.

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