Meth boom adds to Afghanistan's opium and heroin woes

At a sprawling rehabilitation centre on the outskirts of Kabul, dozens of dazed-looking drug addicts clamber out of police buses and shuffle toward the facility.

The men, arrested on the streets of the Afghan capital, have been sent to a compulsory detox programme established to tackle an explosion in the use and production of highly addictive methamphetamine.