Launched a year ago, Philippine President Rodrigo Duterte's brutal war on drugs has resulted in thousands of deaths, yet the street price of crystal methamphetamine in Manila has fallen and surveys show Filipinos are as anxious as ever about crime.

Duterte took power on June 30 last year, vowing to halt the drug abuse and lawlessness he saw as "symptoms of virulent social disease."

Thanks to his campaign, government officials say, crime has dropped, thousands of drug dealers are behind bars, a million users have registered for treatment, and future generations of Filipinos are being protected from the scourge of drugs.