Iranian anti-narcotics policemen demonstrate their weapons skills during a ceremony concluding anti-narcotics manoeuvres in Zahedan,1,605 kilometers (1,003 miles) southeast of Tehran May 20, 2009. The head of the U.N. crime agency praised Iran during a visit on Wednesday for curbing the flow of smuggled heroin from Afghanistan and helping keep the drug off Western streets. REUTERS/Caren Firouz (IRAN CRIME LAW POLITICS SOCIETY) 

Iranian anti-narcotics policemen stand at attention during a ceremony concluding anti-narcotics manoeuvres in Zahedan, 1,605 kilometers (1,003 miles) southeast of Tehran May 20, 2009. The head of the U.N. crime agency praised Iran during a visit on Wednesday for curbing the flow of smuggled heroin from Afghanistan and helping keep the drug off Western streets. Picture taken May 20, 2009. REUTERS/Caren Firouz (IRAN CRIME LAW POLITICS SOCIETY) 

An Iranian anti-narcotics policeman demonstrate their weapons skills during a ceremony concluding anti-narcotics manoeuvres in Zahedan, 1,605 kilometers (1,003 miles) southeast of Tehran May 20, 2009. The head of the U.N. crime agency praised Iran during a visit on Wednesday for curbing the flow of smuggled heroin from Afghanistan and helping keep the drug off Western streets. Picture taken May 20, 2009. REUTERS/Caren Firouz (IRAN CRIME LAW POLITICS SOCIETY) 

Confiscated opium is seen on display during a ceremony concluding anti-narcotics manoeuvres in Zahedan, 1,605 kilometers (1,003 miles) southeast of Tehran May 20, 2009. The head of the U.N. crime agency praised Iran during a visit on Wednesday for curbing the flow of smuggled heroin from Afghanistan and helping keep the drug off Western streets. Picture taken May 20, 2009. REUTERS/Caren Firouz (IRAN CRIME LAW POLITICS SOCIETY) 

Confiscated opium is seen on display beside rifles during a ceremony concluding anti-narcotics manoeuvres in Zahedan, 1,605 kilometers (1,003 miles) southeast of Tehran May 20, 2009. The head of the U.N. crime agency praised Iran during a visit on Wednesday for curbing the flow of smuggled heroin from Afghanistan and helping keep the drug off Western streets. Picture taken May 20, 2009. REUTERS/Caren Firouz (IRAN CRIME LAW POLITICS SOCIETY) 

Antonio Maria Costa, director of the U.N. Office on Drugs and Crime (UNDOC), holds a packet of hashish during a ceremony concluding anti-narcotics manoeuvres in Zahedan, 1,605 kilometers (1,003 miles) southeast of Tehran May 20, 2009. Costa praised Iran during a visit on Wednesday for curbing the flow of smuggled heroin from Afghanistan and helping keep the drug off Western streets. Picture taken May 20, 2009. REUTERS/Caren Firouz (IRAN CRIME LAW POLITICS SOCIETY) 

Antonio Maria Costa, director of the U.N. Office on Drugs and Crime (UNDOC), feels the weight of a bag of opium on display during a ceremony concluding anti-narcotics manoeuvres in Zahedan, 1,605 kilometres (1,003 miles) southeast of Tehran May 20, 2009. The head of the U.N. crime agency praised Iran during a visit on Wednesday for curbing the flow of smuggled heroin from Afghanistan and helping keep the drug off Western streets. REUTERS/Caren Firouz (IRAN CRIME LAW POLITICS SOCIETY) 

Antonio Maria Costa, director of the U.N. Office on Drugs and Crime, watches a ceremony concluding anti-narcotics manoeuvres in Zahedan, 1,605 kilometers (1,003 miles) southeast of Tehran May 20, 2009. Costa praised Iran during a visit on Wednesday for curbing the flow of smuggled heroin from Afghanistan and helping keep the drug off Western streets. REUTERS/Caren Firouz (IRAN CRIME LAW POLITICS SOCIETY) 

Iran's police chief Ismail Ahmadi Moghaddam (R) speaks during a ceremony concluding anti-narcotics maneuvers in Zahedan, 1,605 kilometers (1,003 miles) southeast of Tehran May 20, 2009. The head of the U.N. crime agency praised Iran during a visit on Wednesday for curbing the flow of smuggled heroin from Afghanistan and helping keep the drug off Western streets. REUTERS/Caren Firouz (IRAN CRIME LAW POLITICS SOCIETY) 

An Iranian anti-narcotics policeman stands guard beside a display of confiscated drugs during a ceremony concluding anti-narcotics manoeuvres in Zahedan, 1,605 kilometers (1,003 miles) southeast of Tehran May 20, 2009. The head of the U.N. crime agency praised Iran during a visit on Wednesday for curbing the flow of smuggled heroin from Afghanistan and helping keep the drug off Western streets. Picture taken May 20, 2009. REUTERS/Caren Firouz (IRAN CRIME LAW POLITICS SOCIETY) 

An Iranian anti-narcotics policeman gestures during a ceremony concluding anti-narcotics manoeuvres in Zahedan, 1,605 kilometers (1,003 miles) southeast of Tehran May 20, 2009. The head of the U.N. crime agency praised Iran during a visit on Wednesday for curbing the flow of smuggled heroin from Afghanistan and helping keep the drug off Western streets. Picture taken May 20, 2009. REUTERS/Caren Firouz (IRAN CRIME LAW POLITICS SOCIETY) 

Iranian anti-narcotics policemen create a human pyramid during a ceremony concluding anti-narcotics manoeuvres in Zahedan, 1,605 kilometers (1,003 miles) southeast of Tehran May 20, 2009. The head of the U.N. crime agency praised Iran during a visit on Wednesday for curbing the flow of smuggled heroin from Afghanistan and helping keep the drug off Western streets. Picture taken May 20, 2009. REUTERS/Caren Firouz (IRAN CRIME LAW POLITICS) 

Iranian anti-narcotics policemen watch guests, officials and journalists from the shade of a tree at a police barracks on the border with Afghanistan near Zabol, 1,605 kilometers (1,003 miles) southeast of Tehran May 20, 2009. The head of the U.N. crime agency praised Iran during a visit on Wednesday for curbing the flow of smuggled heroin from Afghanistan and helping keep the drug off Western streets. Picture taken May 20, 2009. REUTERS/Caren Firouz (IRAN CRIME LAW POLITICS SOCIETY) 

Antonio Maria Costa, director of the U.N. Office on Drugs and Crime (UNDOC), presses his finger on confiscated opium during a ceremony concluding anti-narcotics manoeuvres in Zahedan, 1,605 kilometers (1,003 miles) southeast of Tehran May 20, 2009. Costa praised Iran during a visit on Wednesday for curbing the flow of smuggled heroin from Afghanistan and helping keep the drug off Western streets. REUTERS/Caren Firouz (IRAN CRIME LAW POLITICS SOCIETY) 

A drug sniffing dog and handler stand beside confiscated opium on display during a ceremony concluding anti-narcotics manoeuvres in Zahedan, 1,605 kilometers (1,003 miles) southeast of Tehran May 20, 2009. The head of the U.N. crime agency praised Iran during a visit on Wednesday for curbing the flow of smuggled heroin from Afghanistan and helping keep the drug off Western streets. REUTERS/Caren Firouz (IRAN CRIME LAW POLITICS SOCIETY) 

Confiscated hashish is seen on display during a ceremony to conclude anti-narcotics manoeuvres in Zahedan, 1,605 kilometers (1,003 miles) southeast of Tehran May 20, 2009. The head of the U.N. crime agency praised Iran during a visit on Wednesday for curbing the flow of smuggled heroin from Afghanistan and helping keep the drug off Western streets. Picture taken May 20, 2009. REUTERS/Caren Firouz (IRAN CRIME LAW POLITICS SOCIETY) 

An aerial view shows the terrain on the border region between Iran and Afghanistan near Zabol, 1,605 kilometers (1,003 miles) southeast of Tehran May 20, 2009. Iran, which shares a 900-km (560-mile) border with Afghanistan, is a conduit for smuggling drugs to the West from its insurgency-ridden neighbour. Picture taken May 20, 2009. REUTERS/Caren Firouz (IRAN CRIME LAW POLITICS SOCIETY) 

Antonio Maria Costa, director of the U.N. Office on Drugs and Crime (UNDOC), reviews an honour guard with Iranian commanders during a ceremony concluding anti-narcotics manoeuvres in Zahedan, 1,605 kilometers (1,003 miles) southeast of Tehran May 20, 2009. Costa praised Iran during a visit on Wednesday for curbing the flow of smuggled heroin from Afghanistan and helping keep the drug off Western streets. REUTERS/Caren Firouz (IRAN CRIME LAW POLITICS) 

Iranian anti-narcotics policemen demonstrate their weapons skills during a ceremony concluding anti-narcotics maneuvers in Zahedan, 1,605 kilometers (1,003 miles) southeast of Tehran May 20, 2009. The head of the U.N. crime agency praised Iran during a visit on Wednesday for curbing the flow of smuggled heroin from Afghanistan and helping keep the drug off Western streets. REUTERS/Caren Firouz (IRAN CRIME LAW POLITICS SOCIETY) 

Iranian anti-narcotics policewomen stand at attention during a ceremony concluding anti-narcotics manoeuvres in Zahedan, 1,605 kilometers (1,003 miles) southeast of Tehran May 20, 2009. The head of the U.N. crime agency praised Iran during a visit on Wednesday for curbing the flow of smuggled heroin from Afghanistan and helping keep the drug off Western streets. REUTERS/Caren Firouz (IRAN CRIME LAW POLITICS SOCIETY) 

A bullet hole is seen in the windshield of a car, confiscated for transporting drugs, on display during a ceremony concluding anti narcotics manoeuvres in Zahedan, 1,605 kilometers (1,003 miles) southeast of Tehran May 20, 2009. The head of the U.N. crime agency praised Iran during a visit on Wednesday for curbing the flow of smuggled heroin from Afghanistan and helping keep the drug off Western streets. REUTERS/Caren Firouz (IRAN CRIME LAW POLITICS SOCIETY) 

An Iranian policeman stands guard atop a watch tower beside the Afghan border near Zabol, 1,605 kilometers (1,003 miles) southeast of Tehran May 20, 2009. Iran, which shares a 900-km (560-mile) border with Afghanistan, is a conduit for smuggling drugs to the West from its insurgency-ridden neighbour. REUTERS/Caren Firouz (IRAN CRIME LAW POLITICS SOCIETY) 

Iranian anti-narcotics policemen stand at attention during a ceremony concluding anti-narcotics manoeuvres in Zahedan, 1,605 kilometers (1,003 miles) southeast of Tehran May 20, 2009. The head of the U.N. crime agency praised Iran during a visit on Wednesday for curbing the flow of smuggled heroin from Afghanistan and helping keep the drug off Western streets. REUTERS/Caren Firouz (IRAN CRIME LAW POLITICS SOCIETY) 

Iranian anti-narcotics policemen march in formation during a ceremony concluding anti-narcotics manoeuvres in Zahedan, 1,605 kilometers (1,003 miles) southeast of Tehran May 20, 2009. The head of the U.N. crime agency praised Iran during a visit on Wednesday for curbing the flow of smuggled heroin from Afghanistan and helping keep the drug off Western streets. REUTERS/Caren Firouz (IRAN CRIME LAW POLITICS SOCIETY) 

An Iranian anti-narcotics policeman stands guard at a police barracks on the border with Afghanistan, near Zabol, 1,605 kilometers (1,003 miles) southeast of Tehran May 20, 2009. Iran, which shares a 900-km (560-mile) border with Afghanistan, is a conduit for smuggling drugs to the West from its insurgency-ridden neighbour. The Farsi script, a quote from Iran's Supreme Leader Ayatollah Ali Khamenei says "The police force must be respected by the people." Picture taken May 20, 2009. REUTERS/Caren Firouz (IRAN CRIME LAW POLITICS SOCIETY) 

An Iranian anti-narcotics policeman stands guard beside the border barrier with Afghanistan near Zabol, 1,605 kilometers (1,003 miles) southeast of Tehran May 20, 2009. Iran, which shares a 900-km (560-mile) border with Afghanistan, is a conduit for smuggling drugs to the West from its insurgency-ridden neighbour. REUTERS/Caren Firouz (IRAN CRIME LAW POLITICS SOCIETY) 

Iranian anti-narcotics policemen protect themselves from blowing sand at a police barracks on the border with Afghanistan near Zabol, 1,605 kilometers (1,003 miles) southeast of Tehran May 20, 2009. Iran, which shares a 900-km (560-mile) border with Afghanistan, is a conduit for smuggling drugs to the West from its insurgency-ridden neighbour. REUTERS/Caren Firouz (IRAN CRIME LAW POLITICS SOCIETY) 

A member of a helicopter crew removes wheel-blocks before take off from the airport in Zahedan, 1,605 kilometers (1,003 miles) southeast of Tehran May 20, 2009. REUTERS/Caren Firouz (IRAN SOCIETY TRANSPORT)